CARNEGIE INSTITUTION OF WASHINGTON

DEPARTMENT OF GENETICS

COLD SPRING HARBOR, LONG ISLAND. N. Y.

June 23, 1953

Dr. Joshua Lederberg
Department of Genetics
University of Wisconsin
Madison, Wisconsin

Dear Joshua:

I am writing to ask whether you can help us out of a difficulty
we have run into in connection with our Bacterial Genetics course,

As you may know, we include in our curriculum a simple recombin-
ation experiment using K-12, which will be supervised this year by
Norton Zinder. We find that the stocks we have used previously
are lost, and Norton has suggested that we ask you if you could
supply them for us. We need Y-l1\0, Y-70, Y-70/1 (if you have it---
otherwise we can put the phage markers on Y-/0 here), and 58-161,
The course starts July 15, and as we like to run through each ex-
periment beforehand, we would be deeply grateful if you could

send us the stocks immediately. If any of these is not available,
we could use any set of stocks that would make possible a simple
cross, reciprocal with regard to unselected markers,

Also, we are trying to build up a reprint library for use by our
students, and would appreciate your sending us for this purpose
two copies of any of your reprints that may be available,
With best wishes for a pleasant summer,
Cordially yours,
- ae (yr
EMW: bl Evelyn M. Witkin