January 31, 1?57

Dr. Adelaide E. Evenson
Department of B~cteriolo~
rhivcmity of Arizona
Tucson, Arizona

  Thank you for your cordial lettbcr af Januzmy 15, I
would J-)t3 honored to -ive such a lecture in Powellls %st,
and not having had an @arlier opportunity to visit %uthern
Arizona would look forward to the occasion with delight.

  Enfortun f;ely, you could riot knoxin-ly have chomn a
less propitious or _ harrassed tb~e in my own affairs.     &o-Q-
Tm this reason which is entirely b>ronr? my control I mst
*
regretfully de&ins for the pmaenb occasion,  I a3 truly
sorry to ham to pass over this oppmtunity.

Yours simerely,

Joshua Lederberg
Trofessor of Gem3tics

J3.i:nh.n