Department of Genetics
University of Wieconsin
Madison 6, Wis.

April 12, 1953

Professor Frank Fenner
Department of MicrobLology
Australian National University
Canberra, AsCeTs

Dear Dr. Fenner:

I shall be delighted to have an opportunity to talk with you.
If it does not put you too much out of your way, I would prefer
seeing you here over taking the chance of finding the tine at
the Cold Spring Harbor Symposium. We have not yet fixed our own
plans for the Symposium, but it is quite likely I shall be here
at least through June 1, and will be very happy if you can visit
at that time. If you can arrange to let me know where you wil?
be a few days before, I could wire you any last minute changes
of plan. But I think I can guarantee June 1, 1f this is agrecable
to you.

We have been especially occupied lately with the genetic deterni-
nation of flagellar serotypes and phase variation in Salmonella,
Aside from the artificial synthesis of any number of new and old
"species", the work has uncovered some quite interesting features
from a "developmental" viewpoint, and I welcome the chence to dis-
cuss these with you, in the light of your remarks in the review
which appeared in Heredity some time ago.

Yours sincerely,

Joshua Lederberg
Agscciate Professcr of Geneti: