February 12, 1958

Dr. John Yudkin
Department of Nutrition
Queen Elizabeth College
Campden Hill Road
London, WW. 8., England

Dear John:

The second culture that you sent arrived here only just last week,
and we have not had eny chance to do anything with it as yet. Meanrhile,
I have gotten involved with the Hemophilus system, in order to get some
experience on one which is in general use. We will get back to coli the
first opportunity and I will not waste any time in letting you know of
our resulte.

Frankly, your success with these strains seems almost too good to be
true in view of the number of people who have skinned their knuckiies on
the same problem, We do hore that your inquiry has no imutation of .-
doubt for that would be 2 great shame. I wovld certainly appreciate your
letting me know if there are any important developments that would be
relevant to our interest in working out a sound structure for genetic
analysis by DNA transduction.

With best regards,

Yours cordially,.

Joshua Lederberg
Professor of Madical Genetics

JL/ew