February 18, 1958

Dr. B. ae D. Stocker
Lister Institute
Chelsea Bridge Rd.
London S#, Englanc

Dear Bruce:

I have made at least ons qick look for the X~phage that you asked
about in your letter of the 9th. I don't find any very useful samples.
Aleck Bernstein was the last fellow to do some work cn this and I ama
little surprised that he did not bring some samples back home with hia.
If he could give me some clue where he left his best preparations, if he
did so, I might still be able to help you out. I will have another look
in any cause.

As concerns the symposium, I don't want to impose too much on your
own judgment. On the whole I think the general bases of biochemical
genetics are pretty well understood and should act require very auch re—
statement. However, insofar as they influence your own methodology in
approaching infectious disease from a genetic standpoint, there is every
reason to bring up questions both of biochemical genetics and the basic
mechanisas of genetic transfer in bacteria. I don't think I will be
making an opening address; in any case you don't want to count on it.

It's too bad you won't be getting down to Gatlinburg. That promises
to be an extraordinary meeting.

Thank you very mich for the pos%exs: which just arrived.
With best wishes to you all,

Yours sincerely,

Joshua Lederberg
Professor of Medical Genetics

JL/ew