July 25, 1973
Dear Dr. Mirsky,
This letter is to acknowledge receipt of your letter of June 29, following our phone conversation yesterday. As I indicated, I returned last week from the Int. Biochem. Congress and moved my laboratory on Monday, hence the delay in replying.
I was very interested in your letter and very pleased to receive it. As I have indicated I am most concerned to arrive at a balanced and objective account of what actually occurred in this area. In that respect your letter is invaluable giving as it does your own views and material not readily available.  I would personally
value the opportunity to view the reports of the Board of Scientific Directors of the Rockefeller Institute, which are particularly relevant to DNA work in view of the centrality of Levene, Avery, Hotchkiss, yourself and many others to that
work.  Could this be arranged?  If you cannot pass this request on could you let me know the appropriate person to whom I should write.
I should emphasize that my paper was intended to be devoted exclusively to the chemical work relevant to DNA.  I have, of course, left out things (of which people keep reminding me, such as synthesis of purines and pyrimidines, staining, etc.).
These will be covered in our book.  In addition my treatment of Avery's work and the connection with your own was only intended to be superficial, insofar as it related to Levene's work, and also in order to effectively answer Stent's contentions. There is no question that I will revise this section in order to take account of your views
I will follow up on all the sources you give me.
Yours sincerely,
Jack S. Cohen
Reproduction Research Branch
National Institute of Child Health and Human Development