January 30, 1941
Dear Warren:
I am looking forward to seeing you when you come to Pasadena.  On reconsidering the proposal which I made in my letter, it seems to me too that I was carried away somewhat by my enthusiasm for a new field, and that it would be wise to set up at first a smaller organization and attack the problem more slowly.  Our principal need is to get Dan Campbell here, or some similarly well-trained immunologist.  Campbell, with his interest in chemistry, seems to me to be the best of the younger immunologists for this work.
Sincerely yours,
Linus Pauling