Oct. 24, 1950
Dear Tracy,
I just saw your article in Heredity, 4, 11, 1950.  I read it and found it very exciting, particularly because, by coincidence, I spent last weekend writing on natural relationship of viruses and arrived to the conclusion of the existence, from present day knowledge, of 2 types of cytoplasmic heredity, distinguished on exactly your criteria since you put the whole thing so much better.  I'd like to have your paper available while I write that chapter of my book.  Can you send me a reprint now?
We are getting settled.  How did Theo's operation go?
Best regards,
Luria