February 16, 1946.
Dr. W.3. Stone,
Dent. Genetics,
University of Texas,
Austin, Texas.
Dear Sr. Stone,

I received your manuscript this afternoon. Thanks very auch; it arrives
in good time. By when would you like to have it back, and aiso the sauwe for
the forthcoming "catalase" paper?

Meanwhile, I ay desp&aching the four K-12 cultures you asked for:

Y-10, Y-53, 58-161 and Y-87. Y-87 is Bul-Lac)-V,". Lac needs a gub-
script now because at least 6 other Lactose-negative loci have beed identified.
“he Lac- ef Y~53 aad of Y-~87 are, however, allelic, and in my series Lacy.
Please jet me know of your results with these strains.

Yours sincerely,

Joshua Lederberg