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• LP Research Notebooks, RNB 11 RE: Notes re: x-ray diffraction experiments on cyanogen.
• Notes and electron diffraction data - Germanes [LP and Sidney Weinbaum]
• Notes and electron diffraction data - Indium Trimethyl [LP and Sidney Weinbaum]LP Research Notebooks, RNB 10 RE:

• Letter from Arthur B. Lamb, Editor, Journal of the American Chemical Society to LP RE: Encloses copy for review of S. H. Bauer's "The Structures of the Hydrides of Boron. V" which he has revised according to LP's commentary. [LP's reply February 7, 1938] [Filed under LP Science: Box #14.002, Folder #2.3]
• Letter from Eric Ponder to LP RE: Asks LP if he would join in the Symposium, to begin on June 21st. LP's topic is up to him and hopes that he and AHP will be able to stay in Long Island the entire five weeks of the Symposium. [LP's reply: February 15, 1938] [Filed under: LP Correspondence, Box #312, Folder #312.3]
• Letter from L. C. Cady to Dr. J. Sherman RE: Cady informs Sherman that only an assistant professorship is available in the department, but it will be possible that there will be an instructorship open, that would pay $1800 for ten months. [Filed under: LP Correspondence, Box #304, Folder #304.3]

• Letter from Hugh S. Taylor to LP RE: Suggests to LP that the term conjugation energy should be used rather than resonance energy. [LP's reply: February 7, 1938] [Filed under: LP Correspondence Box #405, Folder #405.6]
• Letter from LP to Arthur B. Lamb, Editor, Journal of the American Chemical Society RE: LP believes that the Journal should publish useful summarizing tables and that kerhff's Table II should be published. [Lamb's letter to LP January 26, 1938] [Filed under LP Science: Box #14.002, Folder #2.3]
• Letter from LP to Dr. J.S. Anderson. [Letter from LP January 18, 1938] [Filed under LP Correspondence: Box #12, Folder #12.4]

  February 2, 1938

  Dr. J. S. Anderson

  Department of Chemistry

  Royal College of Science

  South Kensington

  London, S.W. 7, England

  Dear Dr. Anderson:

  I should be glad to have you include in your textbook on inorganic chemistry the diagram referred to in your letter of January 18th. I wish to point out, on the other hand, that the work of Keggin and later investigators including Bradley indicates strongly that the structure which I proposed for duodeciheteropoly acids is incorrect. The new structure resembles the one which I suggested in its general character but not in detail.

  Sincerely Yours,

  Linus Pauling

  LP/C

• Letter from LP to Dr. S. Dushman RE: LP thanks him for the copy of his book on quantum mechanics. [Filed under LP Correspondence: Box #98, Folder #98.3]
• Letter from LP to Mr. R. M. Triest RE: LP acknowledges receipt of a copy of Volume I of Gilman's "Organic Chemistry" and thanks him for it. [Filed under: W: Correspondence, Box #443, Folder #443.6]

• Letter from Dr. L. G. S. Brooker to LP RE: Asks if it would be convenient to meet on Sunday, February 13. [LP's reply: February 10, 1938] [Filed under LP Correspondence: Box #111, Folder #111.1]
• Letter from LP to Arthur B. Lamb, Editor, Journal of the American Chemical Society RE: LP encloses book review of Vol. II of "A Comprehensive Treatise of Atomic and Molecular Structure." [Filed under LP Science: Box #14.002, Folder #2.3]
• Letter from LP to Arthur B. Lamb, Editor, Journal of the American Chemical Society RE: LP encloses the figures and legends for the paper by Springall and Brockway on electron diffraction investigation of arsenic trimethyl and phosphorus trimethyl which was submitted last month. [Filed under LP Science: Box #14.002, Folder #2.3]
• Letter from LP to Dr. A. R. Todd RE: Asks Todd to please get in touch with Dr. Warren Weaver as he is interested in the development of organic chemistry especially of biological substances. [Weaver's next letter: February 15, 1938] [Filed under: T: Individual Correspondence, Box #407, Folder #407.6]

• AHP writes cheque to: Connecticut Mutual Life Insurance Co., amount $45.50 [Filed under LP Biographical: Box #4.014, Folder #2]
• AHP writes cheque to: Nellie Durby amount $2.15 [Filed under LP Biographical: Box #4.014, Folder #2]
• AHP writes cheque to: Wesley Unfried amount $3.20 [Filed under LP Biographical: Box #4.014, Folder #2]
• Letter from LP to Warren Weaver, Director, The Natural Sciences-The Rockefeller Foundation RE: LP is pleased to learn that the grant application was accepted by the Foundation Board.. He is very interested in protein structure work and would like to prepare a paper on his ideas especially after his disappointing meeting with Dr. Wrinch, whose ideas he feels are unfounded. He also discusses the situation with Corey's appointment and the various research projects being conducted in the lab at that time. [Filed under LP Science: Box #14.038, Folder #38.6]

• Letter from H. Mark to LP RE: Informs LP that he has decided to come to California but cannot get any assurance as to how long the appointment will be. [Filed under: M: Individual Correspondence, Box #244, Folder #244.1]

• Letter from LP to Arthur B. Lamb, Editor, Journal of the American Chemical Society RE: LP returns his report with Dr. Bauer's comments. He would have preferred that Bauer accepted the suggestions completely but feels that the changes are sufficient to merit publication of the paper. [Lamb's letter to LP February 1, 1938] [Filed under LP Science: Box #14.002, Folder #2.3]
• Letter from LP to Professor Hugh S. Taylor. [Taylor's letter: February 2, 1938, Taylor's reply: March 22, 1938] [Filed under: T: Individual Correspondence, Box #405, Folder #405.6]

  February 7, 1938

  Professor Hugh S. Taylor

  Department of Chemistry

  Princeton University

  Princeton, New Jersey

  Dear Professor Taylor:

  I am interested by your suggestion that the term conjugation energy be used instead of resonance energy. I think that it would be perfectly satisfactory to use the term conjugation energy for the resonance energy of systems which are usually described as conjugated. I have not been accustomed to thinking of benzene as a conjugated system and since there is a great increase in resonance energy accompanying the completion of the ring, I am not sure whether it is wise to extend the idea of conjugation to include aromatic resonance. Moreover, the idea of resonance has very wide applications. You may recall my discussion of the partial ionic character of single bonds in terns of resonance of the bond type between the extreme ionic and the extreme covalent structures. The extra energy resulting from this resonance could hardly be called conjugation energy.

  I myself do not feel that the terms resonance and resonance energy are especially unsatisfactory that were introduced into chemistry in a natural way, and the quantum mechanics resonance phenomenon does have some analogy with the classical resonance phenomenon. It is true that the analogy is no longer very close when resonance of molecules among several electron structures is considered, but I feel that the new ideas themselves must be learned and no choice of name could be made which would simplify this problem appreciably.

  I wish again to thank you for your kindness in inviting me to participate in your symposium and in entertaining my wife and me during our visit. I enjoyed the visit immensely and I feel that there is no chemistry laboratory in the country, with the exception of that at Berkeley, which I visit with so much pleasure.

  With kind regards to you and to Mrs. Taylor, I am

  Sincerely yours,

  Linus Pauling

  LP/C

• Letter from Robert W. Price to LP RE: Informs LP that he has accepted an offer from the University of Vermont, to last only one year beginning with summer school of 1937. Price will be taking over Charles E. Braun's position during his leave of absence. Asks LP to keep him in mind for a position next year. [LP's reply: February 11, 1938] [Filed under: LP Correspondence, Box #312, Folder #312.3]
• Note from R. L. Johnson to LP RE: Asks LP to do a water analysis of water from a well in San Luis. [Filed under: J: Correspondence, Box #192, Folder #192.5]

• AHP writes cheque to: Grieve and Jonker amount $6.70 [Filed under LP Biographical: Box #4.014, Folder #2]
• Letter from H. Mark to LP RE: Asks LP's opinion of his coming to U. C. L. A and the risk of giving up a good-paying job in Canada. [Filed under: M: Individual Correspondence, Box #244, Folder #244.1]
• Letter from LP to Dr. L. O. Brockway RE: LP encloses the PF3Cl 2 photographs and suggests he interpret them and include in his paper on phosphorus. LP has learned that the Midgley Foundation has closed and Henne is still looking for a position. Also, LP says he will not be able to attend the British Association meeting this summer. [Brockway's letter concerning the meeting: January 12, 1938] [Filed under LP Correspondence: Box #31, Folder #31.11]
• Letter from LP to Professor W. A. Noyes RE: LP discusses his sketch of the motion of the electrons in a covalent bond. [Noyes' reply: February 14, 1938] [Filed under: N: Individual Correspondence, Box #279, Folder #279.4]
• Letter from Melvin S. Newman to LP RE: Informs LP that he has been considering the desirability of undertaking a new synthesis of the hydrocarbon coronene. Asks LP for help and suggestions for this investigation. [Filed under: N: Correspondence, Box #287, Folder #287.5]

• Letter from David Harker to LP RE: Encloses a reprint of his work with Donnay. [Filed under: H: Individual Correspondence, Box #151, Folder #151.10]
• Letter from E. C. Williams to LP RE: Asking LP for a reference for Mr. Donald S. Taylor who has applied for a position with Shell Development Company. [Filed under: T: Correspondence, Box #410, Folder #410.3]
• Letter from LP to Professor Charles A. Kraus RE: LP expresses his regrets for not getting the reprints regarding Brockway's nomination in sooner but they are being sent now under a separate cover. Goes on the explain that a few pieces are missing due to the exhaustion of reprints. [Kraus's telegram: February 9, 1938] [Filed under LP Correspondence: Box #31, Folder #31.11]
• Telegram from Charles A. Kraus to LP RE: has received the material for the nomination of Brockway however still needs seven sets of reprints. If the reprints are sent promptly he can hold off on the committee process. [Filed under LP Correspondence: Box #31, Folder #31.11]

• Letter from LP to Dr. L. G. S. Brooker, Eastman Kodak Company, RE: Apologizes that a meeting at Ithaca was not arranged but would be glad to discuss by correspondence any questions about work. [Brooker's letter: September 4, 1938] [Filed under LP Correspondence: Box #111, Folder #111.1]
• Letter from LP to Mrs. Martha A. Buchman RE: LP expresses his thanks for her kindness in contributing to the support of the researches being carried on by Dr. Buchman. Also, explains that Dr. Buchman will be remaining permanently. [Filed under LP Correspondence: Box #33, Folder #33.2]
• Letter from LP to Professor DeVane. (Dil-Dyson): Box #96.18]

  February 10, 1938

  Professor M. C. DeVane

  Cornell University

  Ithaca, New York

  Dear Professor DeVane:

  I wish to ask your pardon for my delay in writing to you in connection with our talk about Dr. DuMond. I did not find it possible to compose a letter before leaving Cornell and on arriving in Pasadena I thought it desirable to discuss the situation with Dr. DuMond himself. I have now done this and I am accordingly able to write to you more fully than would have been possible otherwise.

  Dr. J. W. M. DuMond is of the American parentage and French ancestry. He was educated at the California Institute of Technology and the Union College, and worked for a few, years in electrical engineering before taking up physics as a profession. For about fifteen years Dr. DuMond has been intensively carrying on original researches in the x-ray field. He has done this with great success and is, I believe, generally recognized as one of the leading authorities in this field in the country. His principal contributions in recent years have been the design and construction of a multi-crystal x-ray spectrometer, the quantitative study of the Compton effect, the experimental determination of momentum distribution of electrons in atoms, and the accurate determination of physical constants by the inverse photo-electric effect in the x-ray region, he is a well balanced investigator with ability and training along both experimental and theoretical lines.

  About eight years ago, Dr. DuMond was offered appointment as associate Professor at Stanford University. Instead of accepting this position he chose to remain at the Institute as Research Associate without stipend, his inheritance providing him with a satisfactory income. He has now been put on a different statue at the Institute: he now receives a salary and was offered the choice of professorial appointment or the retention of his title of Research Associate. He selected the latter alternative.

  I learned from talking with him that he feels that it would be wise to leave the x-ray field and begin work in another field of physics in which rapid development is now occurring, that of the study of the structure of the nucleus. It is not possible for him to do this at the Institute because the nuclear field is being exploited here by other members of the physics department and Professor Millikan feels that DuMond should continue to devote his attention to experiments with the x-ray apparatus which he has built. I described to him the mastership at Yale as you had described it to me, and he said that he would without doubt accept the position if it were offered to him, providing that funds for support of his research project were made available.

  Dr. DuMond is a man of pleasing personality and appearance with a charming wife, a native of France, and two children. He has broad interests, and I feel that he can be recommended to you strongly. I would not like to see him leave the Institute, but I agree with him that his work could probably be carried out more successfully in another institution, where he would have greater freedom of activity and greater scope for the exercise of his talents than he has here.

  With best regards, I am

  Sincerely yours,

  Linus Pauling

  LP/C

• Letter from LP to Professor J. Papish RE: Thanks Papish for having invited him to visit Cornell. LP explains that since his return, he has been busy catching up on his work and will now be able to settle down to complete his manuscript. [Filed under LP Books: Box 1939b, Folder 1939b.2]
• Statement of Chemistry Accounts [Filed under LP Biographical: Box #1.031, Folder #31.1]

• Letter from F. T. Brooks, British Association, to LP RE: A formal invitation inviting LP to the Annual Meeting of the Association August 17-24. Asks that a reply be given as soon as possible. [Filed under LP Correspondence: Box #37, Folder #37.5]
• Letter from Julian M. Sturtevant to LP RE: Sturtevant purposes writing a review article on the phases of the quantum mechanical theory, so that an average chemist would easily be able to follow. [LP's reply: February 16, 1938] [Filed under: S: Individual Correspondence, Box #370, Folder #370.5]
• Letter from LP to Dr. Robert W. Price RE: LP reports that there will be no professional position available next year. However, if he is interested in a position as Research Associate or Research Fellow, LP suggests that he write back again in March. [Price's letter: February 7, 1938] [Filed under: LP Correspondence, Box #312, Folder #312.3]

• AHP writes cheque to: Southern Gas Co. Of California amount $13.08 [Filed under LP Biographical: Box #4.014, Folder #2]

• Letter from Howard A. Poillon to LP RE: Thanks LP for the letter of February 10th. Is glad to hear that the work is so satisfactory. [Filed under: LP Correspondence, Box #312, Folder #312.3]
• Letter from LP to Dean of the Graduate School, Brown University, RE: LP writes to recommend Mr. Anderson Pace of Cornell University in connection to his application for a graduate fellowship. [Filed under: LP Correspondence, Box #312, Folder #312.3]
• Letter from LP to Dr. David Harker RE: Thanks Harker for the reprints and asks that his paper be presented by one of the graduate students to the seminar. [Filed under: H: Individual Correspondence, Box #151, Folder #151.10]
• Letter from LP to E. C. Barrett, C. I. T. RE: At the request of the Council of the Division of Chemistry and Chemical Engineering, LP recommends to the Executive Council that a grant of $50.00 be made to Mr. LeRoy H. Anderson to assist him in carrying on graduate studies in chemistry during the second and third terms of the present academic year. [Filed under LP Science: Box #14.038, Folder #38.3]
• Letter from LP to E. C. Barrett, C. I. T. RE: LP recommends that Mrs. Beverly Shaffer be appointed Office Assistant in Chemistry, beginning Feb. 1, 1938 with a salary of $80.00 per month (to be paid from the Rockefeller Fund from Feb. to June). [Filed under LP Science: Box #14.038, Folder #38.3]
• Letter from LP to Mr. J. E. Coates RE: LP is unable to attend the chemistry meeting of the British Association for the Advancement of Science in August due to the many pressures and duties in Pasadena. [Coates' letter: January 18, 1938] [Filed under LP Correspondence: Box #37, Folder #37.5]
• Letter from LP to Professor N. V. Sidgwick RE: LP regrets to say that he will be unable to visit England and attend the meetings of the British Association at Cambridge in August. LP has resubmitted the nomination of Brockway for the American Chemical Society Award and asks Sidgwick to write a letter in support of him. [Filed under LP Correspondence: Box #364, Folder #364.1]
• Letter from LP to Professor Victor K. LeMer RE: LP inquires whether he still plans to come to Pasadena from February 1 to March 15 of this year. [Filed under: L: Individual Correspondence, Box #212, Folder #212.4]
• Letter from W. A. Noyes to LP RE: Thanks LP for his previous letter. Discusses with LP the quantum mechanics functions for hydrogen molecules. [LP's letter: February 8, 1938] [LP's reply: February 21, 1938] [Filed under: N: Individual Correspondence, Box #279, Folder #279.4]

• LP writes cheque to: George C. Gebelein amount $20.21 [Filed under LP Biographical: Box #4.014, Folder #2]
• Letter from Alex R. Todd to LP RE: Is very excited about his Vitamin E work as he may be close to reaching his goal but looks forward to his trip to Pasadena. [LP's letter: February 4, 1938] [Filed under: T: Individual Correspondence, Box #407, Folder #407.6]
• Letter from John Y. Beach to LP RE: Asks if he received the Indianapolis manuscript he sent by air mail. [Filed under LP Correspondence: Box #27, Folder #27.1]
• Letter from LP to Dr. H. Mark RE: LP does not advise that Mark give up his current position in Canada as the prospects of the job at U. C. L. A do not appear that promising. [Filed under: M: individual Correspondence, Box #244, Folder #244.1]
• Letter from LP to Eric Ponder RE: LP is very interested in attending the symposium however, regrets that the problems arising from the completion of the new laboratory will prevent him from coming East at that time. [Ponder's letter: February 1, 1938] [Filed under: LP Correspondence, Box #312, Folder #312.3]
• Letter from LP to Jonas Nilsen RE: LP sends reprints of five papers as he had requested and reports that he has not yet, studied hornblende or pyroxen. [Filed under: N: Correspondence, Box #287, Folder #287.5]
• Letter from LP to Mr. Walter A. Hubbard RE: LP is pleased to learn of the progress Hubbard has made with his ores. Explains that he has spent the last four months at Cornell, Ithaca and New York lecturing on the Nature of the Chemical Bond. [Filed under: H: Correspondence, Box #165, Folder #165.3]
• Letter from LP to Mr. William D. Crane RE: Explains that his offer of $10,000.00 for Crane's property was accepted however, LP was counting on the backing of the California Institute. At this time LP suggests it will be more convenient to put the title vested in the Institute rather than in his name. The matter has already been put in escrow with the Title Insurance and Trust Company in Los Angeles. [Filed under LP Correspondence, Box #74, Folder #74.6]

• Letter from LP to Dr. Julian M. Sturtevant RE: It is hard to express an opinion about the suggested review article due to the fact that the outline given is so broad. Thus, LP suggests that Sturtevant restrict the discussion somewhat. [Sturtevant's letter: February 11, 1938] [Filed under: S: Individual Correspondence, Box #370, Folder #370.5]
• Letter from LP to Dr. Melvin S. Newman. [Filed under: N: Correspondence, Box #287, Folder #287.5]

  February 16, 1938

  Dr. Melvin S. Newman

  Department of Chemistry

  Ohio State University

  Columbus, Ohio

  Dear Dr. Newman:

  I am glad to learn that you are contemplating the synthesis of coronene. There are two problems relating to the structure of polycyclic aromatic hydrocarbons which can be attacked more satisfactorily with use of coronene tha[n] with related substances. The first of these, involving the configuration of the molecule and in particular the values of interatomic distances can be attacked by the study of the structure of the coronene crystal with x-rays. Coronene is especially useful because of the high symmetry of the molecule. The second, bearing on the diamagnetic anisotropy of the substance can be attacked by making measurements on the crystal. Here, too, the high symmetry is important in that it permits the solution of the secular equation for the susceptibility, as discussed in the accompanying reprint.

  I believe that the measurement of the heat of combustion of coronene by the standard method involving the solid would be useful. The accurate methods based on heats of hydrogenation of vapors as applied by Kistiakowsky probably could not be used because of the low vapor pressure of the substance.

  Sincerely yours,

  Linus Pauling

  LP/C

• AHP writes cheque to: Lola Cook amount $10 [Filed under LP Biographical: Box #4.014, Folder #2]
• Letter from David Harker to LP RE: Is delighted that LP wishes that his paper be presented to his seminar. Explains that his research is mainly concerned with the building of x-ray tubes. [Filed under: H: Individual Correspondence, Box #151, Folder #151.10]
• Letter from LP to Dr. Richard C. Tolman RE: LP reports on the ranks of the men at the four universities discussed earlier. [Filed under: T: Individual Correspondence, Box #407, Folder #407.7]
• Letter from W. F. Coover to LP RE: Coover informs LP of an assistant professorship that will be created here next year for part time in both the Chemistry Department and Plant Chemistry section. Asks LP if he can recommend anyone for this position. [LP's reply: March 4, 1938] [Filed under: LP Correspondence, Box #304, Folder #304.3]

• AHP writes cheque to: Nellie Durby amount $3.15 [Filed under LP Biographical: Box #4.014, Folder #2]
• Letter from L. G. S. Brooker, Eastman Kodak Company, RE: Apologizes for missing LP in Ithaca but will be happy to take advantage of sending drafts of the papers that can be discussed before publication. [LP's letter: February 10, 1938] [Filed under LP Correspondence: Box #111, Folder #111.1]
• Letter from Oliver Wulf to LP RE: Wulf encloses the figures that LP had asked for previously. Explains that his work with Jones on the ortho effect in the region of the second overtone have been going well and that he is currently working with Mrs. Deming to analyze some of the earlier absorption curves. [Filed under: W: Correspondence, Box #443, Folder #443.6]

• AHP writes cheque to: Nora Gard Miller amount $10 [Filed under LP Biographical: Box #4.014, Folder #2]
• AHP writes cheque to: Sanitary Laundry amount $2.35 [Filed under LP Biographical: Box #4.014, Folder #2]
• AHP writes cheque to: Wesley Unfried amount $4.80 [Filed under LP Biographical: Box #4.014, Folder #2]
• Letter from L. F. Malowan to LP RE: Malowan thanks LP for the interview in his office and will submit to Dr. Morgan his application for laboratory facilities for doing research work on enzymes in September. [LP's reply: February 23, 1938] [Filed under: M: Correspondence, Box #255, Folder #255.5]

• Letter from Carl Niemann to LP RE: Updates LP on his work and experiences in London particularly about his visits to laboratories in Switzerland. Niemann gives LP Dr. Morrel's address so he may be contacted as assistant when Niemann returns from London. [LP's letter: December 31, 1937] [Filed under: N: Individual Correspondence, Box #277, Folder #277.5]

• AHP writes cheque to: G. Virginia Gallatz amount $12 [Filed under LP Biographical: Box #4.014, Folder #2]
• Letter from G. A. Linhart to LP RE: Linhart reports that because of the inclement of weather in Riverside for the last three weeks he was unable visit but asks if it will be possible to visit next Saturday. [Filed under: L: Correspondence, Box #230, Folder #230.4]
• Letter from G. Schwarzenbach, The Rockefeller Institute for Medical Research to LP RE: Schwarzenbach would like to come to C. I. T. and spend three months working in the lab during spring/summer for the remainder of his Rockefeller Fellowship. He is interested in resonance phenomena. [LP's reply to Schwarzenbach February 24, 1938] [Filed under LP Science: Box #14.037, Folder #37.6]
• Letter from H. Mark to LP RE: Thanks LP for his letter and informs him that he has not accepted the position at U. C. L. A. [Filed under: M: Individual Correspondence, Box #244, Folder #244.1]
• Letter from LP to Arthur B. Lamb, Editor, Journal of the American Chemical Society RE: LP recommends that the communication by T. D. O'Brien be not accepted for publication. He goes on to list his reasons. [Filed under LP Science: Box #14.002, Folder #2.3]
• Letter from LP to Professor E. C. Watson RE: Thanking Watson for his gift to the Division of Chemistry and Chemical Engineering. [Filed under: W: Correspondence, Box #443, Folder #443.6]
• Letter from LP to Professor Farrington Daniels, University of Wisconsin, RE: is sending Dr. Beach's manuscript on "The Electron Diffraction Investigation of the Structure of Gas Molecules" to be included in the series of Symposium papers. [Filed under LP Correspondence: Box #27, Folder #27.1]
• Letter from LP to Professor L. C. Cady RE: LP recommends Mr. K. J. Palmer for the position opening in the Chemistry Department at University of Idaho. LP goes on to explain Palmer and his work. [Filed under: LP Correspondence, Box #304, Folder #304.3]
• Letter from LP to Professor W. A. Noyes. [Filed under: N: Individual Correspondence, Box #279, Folder #279.4]

  February 21, 1938

  Professor W. A. Noyes

  University of Illinois

  Urbana, Illinois

  Dear Professor Noyes:

  The quantum mechanics gives a thoroughly detailed picture of the motion of the electrons in the hydrogen atom, so far as it is possible. According to this picture these electrons can be described as moving in orbits around both nuclei. However, you must not draw a definite e[l]liptical orbit or orbit of other shape in closing the two nuclei and say that the electron moves in this orbit. The motion of the electron is not so well defined as that.

  You are right in saying that the spins of the electron in the hydrogen molecule are in opposite directions and that this causes the molecules to be diamagnetic.

  I did not intend to suggest that the statement that the ionization potential of methane is about the same as that of argon, but to point out a mistake in English.

  My argument in 1931 that the carbon atom has a tetrahedral is, I think, still valid.

  With best regards, I am

  Sincerely yours,

  Linus Pauling

  P.S. I do not know of any evidence showing that hypochlorous acid ionizes in any but the first way mentioned by you, giving hydrogen cation and hypochlorous anion.

• Letter from Victor K. LaMer to LP RE: Thanks him for his letter of February 14th. Informs LP that he plans to visit Pasadena either before or after his lecture tour beginning April 1st. Hopes to be able to discuss with LP the possibility that deuterium substitution can affect the color of compounds. [Filed under: L: Individual Correspondence, Box #212, Folder #212.4]

• Letter from C. B. Davis to LP RE: Asks LP if he is equipped to perform tests on a new acqueous solution which he has been able to freeze at -65F. He would like the tests to be done at various dilutions to determine the freezing more accurately. [LP's reply: February 28, 1938] [Filed under LP Correspondence: Box #98, Folder #98.3]
• Letter from John Fulton, Oregon State College to Dr. Sherman (Copy to LP) RE: Explains LP's advocacy for his candidacy for a position at Oregon State College. Encloses an application to be filled out and sent back even though administration may not be able to make any decisions until next month. [Filed under: F: Individual Correspondence, Box #121, Folder #121.15]
• Letter from LP to Dr. L. F. Malowan RE: LP was pleased to talk to him about the program and hopes that he will find it satisfactory to carry on his work at CIT next year. [Malowan's letter: February 19, 1938] [Filed under: M: Correspondence, Box #255, Folder #255.5]
• Letter from LP to Dr. Warren Weaver, Director of the Natural Sciences, The Rockefeller Foundation RE: Questions concerning the budget for 1938-39 to be submitted to Weaver in the spring. [Weaver's reply March 2, 1938] [Filed under LP Science: Box #14.037, Folder #37.8]
• Letter from LP to Dr. Warren Weaver, Director of the Natural Sciences, The Rockefeller Foundation. [Weaver's reply to LP March 2, 1938] [Filed under LP Science: Box #14.037, Folder #37.8]

  February 23, 1938

  Dear Warren:

  I was pleased to learn from Professor Millikan of the action of your Board on our application, and I wish to express to you my thanks for your interest in our work. I am of course aware of the fact that our plans for organic chemistry not only have been developed with the aid of your continued advice but also are based on your initial suggestion and encouragement; and I can foresee that I shall be indebted to you also for the opportunity of carrying on my own scientific work in the future to as great an extent as I have been during the past six years.

  I had two extended talks with Dr. Wrinch, who also spoke at our seminar at Cornell. I was greatly disappointed in her. She did not present as good a case for her theory as do her published papers. I shall send you my report about her soon.

  I am very much interested in protein structure, and since talking with Dr. Wrinch it has seemed to me that I should prepare a paper on my ideas. I have been averse to doing this because of their speculative nature; they are, however, superior to Dr. Wrinch's, in my opinion.

  Would you advise me about Dr. R. B. Corey, formerly with Wyckoff? He has been working here during the last year of his appointment as Associate of the Rockefeller Institute, and has brought some apparatus with him. He is now working, at my suggestion, on diketopiperazine, and his results provide very valuable information regarding the interactions of the polypeptide backbone. It is planned that he continue studying simple crystals related to proteins and also work on proteins themselves. He is an able and well-trained man, and I think that our x-ray program would be aided immensely if he could be retained. On the other hand, the Institute has not planned to add another man to the permanent staff, and moreover, no suitable appointment was mentioned in our tentative budget. Do you think that it would be wise to offer temporary appointment as Senior Fellow in Research to Corey, perhaps for a definite term of three years? I believe that his salary could be included in the molecular-structure budget of $15,000.00 (of which $5,000.00 is provided by the Institute). Would you consider $3000 a suitable salary? I do not know what salary he receives from the Rockefeller Institute. He is married, and is forty years old. He served as instructor at Cornell from 1923 to 1928 and was with Wyckoff from 1928 to 1937.

  There are some additional problems connected with our organic program on which I should like to have your advice. They are outlined on the accompanying pages

  Todd has written that he is applying for the organic professorship at King's College, London, the decision to be made early this month. We may thus lose him before his visit, which is planned for the month beginning March 11th. I have written him asking that he stop in New York to see you.

  English is doing well with his bean-test hormone, traumatin, and Buchman's work on vitamin B₂ analogs is progressing. Buchman is a fine man to have in the laboratory; he is interested in the problems of all the research men and helps with advice. He has a wide knowledge of organic reactions. He will be appointed Senior Fellow in Research next year, without stipend.

  An International Fellow, Delbrück, is now here in Biology, working on bacteriophage. He has impressed by very favorably. His training in physics is good and he attacks biological problems in a sensible way. He understands their nature, whereas Dr. Wrinch does not.

  I am getting more interested in biological problems every day, and am anxious to see our new program in effect.

  Sincerely yours,

  Linus Pauling

• Letter from LP to Mr. O. J. R. Haworth, Secretary British Association, RE: LP regrets that he will be unable to attend this year's meeting in Cambridge during August. [Filed under LP Correspondence: Box #37, Folder #37.5]
• Letter from W. A. Noyes, Jr. to LP RE: Noyes informs LP that he has decided to accept a position at the University of Rochester. [Filed under: N: Individual Correspondence, Box #279, Folder #279.5]

• Letter from Alan Valentine to LP RE: Informing LP that Professor W. A. Noyes will be offered the professor of chemistry position at the University of Rochester. [Filed under: V: Individual Correspondence, Box #425, Folder #425.1]
• Letter from J. W. Williams to LP RE: Invites LP to the American Chemical Society meeting in Milwaukee, Wisconsin on September 5-9. [Filed under: W: Individual Correspondence, Box #438, Folder #438.1]
• Letter from LP to Dr. G. A. Linhart RE: LP will be in his office Saturday morning and is looking forward to seeing him then. [Filed under: L: Correspondence, Box #230, Folder #230.4]
• Letter from LP to Dr. G. Schwarzenbach, The Rockefeller Institute for Medical Research RE: LP would be glad if Schwarzenbach were to come to Pasadena to work for three months during the spring/summer as they are moving into the new laboratory and there is plenty of room and there would be no fees for him to pay either. [Schwarzenbach's letter to LP February 21, 1938] [Filed under LP Science: Box #14.037, Folder #37.6]
• Letter from LP to Professor V. K. LaMer RE: Looks forward to seeing LaMer in April. [Filed under: L: Individual Correspondence, Box #212, Folder #212.4]

• Letter from LP to John Y. Beach, Princeton University, RE: is interested in learning of his acetone studies and suggests he not publish his work until LP can look over his work and compare their results. [Filed under LP Correspondence: Box #27, Folder #27.1]

• AHP writes cheque to: Wesley Unfried amount $3.90 [Filed under LP Biographical: Box #4.014, Folder #2]
• Note from Robert Emerson to LP RE: Emerson tells LP about a E. Rabinowitch who has just arrived to America from England. He is looking for a job and Emerson wonders if LP would be interested in having him speak to a group at CIT regarding Photochemistry. [LP's reply: March 10, 1938] [Filed under: R: Individual Correspondence, Box #326, Folder #326.1]

• LP writes cheque to: American Institute of Physics amount $1.50 [Filed under LP Biographical: Box #4.014, Folder #2]

• Letter from L. C. Cady to LP RE: Thanks LP for the recommendation of K. J. Palmer for an instructorship in the chemistry department at the University of Idaho. Ensures LP that Palmer will be looked at if an opening occurs. [Filed under: LP Correspondence, Box #304, Folder #304.3]
• Letter from LP to Mr. C. B. Davis RE: LP reports he is unable to made the freezing point tests but suggests that Davis write to Smith- Emery Co. [Davis' letter: February 23, 1938] [Filed under LP Correspondence: Box #98, Folder #98.3]
• Letter from LP to Professor E. D. Eastman RE: Thanking Eastman for his letter regarding Nathan Gilbert however, at this time it looks like the job offer will go to Warhaftig rather than Gilbert. [LP's next letter: June 5, 1939] [Filed under LP Correspondence: Box #106, Folder #106.1]
• Letter from LP to Professor Haagen-Smit RE: LP encloses a letter written by Dr. Robert W. Price and in accordance with the letter LP believes he may be interested in being Research assistant to him. [Filed under: H: Correspondence, Box #165, Folder #165.3]
• Letter from Secretary to LP to Secretary of the Department of Chemistry RE: Asks that one thousand sheets of the bond paper used in typing the manuscript of his book be sent to LP. [Filed under LP Correspondence, Box #74, Folder #74.6]