UNITED STATES
ATOMIC ENERGY COMMISSION

WASHINGTON 25, D. C.
IN REPLY REFER TO:

BMB: MRZ

March 7, 1950

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

Dear Josh:

I got the cultures sent off last time rather huryedly and did not
have time to enclose the family trees. You can always work back=
wards from the members of the cultures, which you have probably done
by now, but I am including the pedigrees. I have been so busy that

I haven't had a chance to check the information on the various cards
back against the records but will do so at my earliest opportunity.
Incidently, with a possible exception of a run next week, I vrobably
won't be able to do anything further until the week of March 19 to 25.
The rate of segregation is, as you say, damnably low, but I agree
that H226 is one we would like to analyze thoroughly. Your two vials
of synthetic medium and lactose arrived Mut the vial of culture was
broken. I have been carrying H226 on EMS-lac plates and perhaos let
it set too long this last transfer, so maybe you had better send me
another vial of H226 in the synthetic medium. I also have enough
vials for only about one more session. Do you suppose it is possible
to buy the bakelite caps separately?

I am naturally curious about the outcome of the Oak Ridge trip but
won't ask any questions.

Very truly yours,

 

Max R. Zelle
Geneticist, Biology Branch
Division of Biology and Medicine