February 12, 1944

Dr. Michael Heidelberger

Columbia University

College of Physicians and Surgeons

620 West l68th Street

New York, 32, New York

Dear Michael:

I was very pleased to receive your letter of February 6. I assure you that there was no need for you to send me an apology, and that I was not at all upset or displeased by Kabat. I have been so busy recently that I had not had time to read Kabat's article, although I noticed that it had been published, and I was interested to see what he had written about our work on artificial antibodies. I do not have any objection to telling about the progress of our animal protection experiments, although, I am, of course, disappointed that the work is progressing so slowly, and that the results are not more satisfactory. We would have more results by this time if the war had not slowed up our activity in this field. As I said during my visit with you, I am still hopeful that some Interesting results will come from these experiments as they are continued.

I enjoyed my talk with you very much indeed. It is always stimulating to me to have a visit with you, and you may be assured that I shall continue to drop in to see you whenever I can.

Dr. Burnet is coming over to see us tomorrow. I am looking forward to getting acquainted with him.

Sincerely yours,

Linus Pauling

LP: jr