sept. 10, 1947

Dr. M. R. Irwin

Dept. of Genetics
University of Wisconsin
Madison, Wisconsin

Dear Dr. Irwin:

We are sending several packages in care of the
Genetics Dept. Express Collect. I would appreciate it if
you would accept these packages for us. I will repay you
for them when I arrive at Madison.

Among these packages will be two marked: "Cultures;
Please Refrigetate on Arrival." It would be very helpful if
these could be stored betweem -5 to +10 C. as soons as they
are received. Thank you very much.

Yours sincerely,

J

J. Lederberg.