11 February 1954
Dr. Robley C. Williams
Virus Laboratory
University of California
Berkeley 4, Calif.
Dear Dr. Williams:
About two years ago you kindly sent me an electron-micrograph of a flagellum of a diphtheroid bacterium, Plate No. 389D. You also were good enough to send me a lantern slide. Professor Corey and Roger Hayward and I are preparing for the Scientific American an article on the structure of the α-keratin proteins, and we should like to use your electron micrograph as an illustration of helical structure. May we have your permission to do so?
With best regards, I am
Sincerely yours,
Linus Pauling:W