"I am very much interested in the fact that you feel that there is a reasonably good chance for the development of an instrument based upon the magnetic susceptibility of hemoglobin and its compounds which would provide for the detection of carbon monoxide."
Warren C. Johnson. Letter to Linus Pauling. April 22, 1942.

"In regard to the carbon monoxide project, unless there is some other method of approach it would appear to me without a too careful analysis that the hemoglobin method is not suitable for adaption to an airplane instrument."
Warren C. Johnson. Letter to Linus Pauling. March 23, 1943.

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