October 22, 1947.
Dr. H. N. Eisen,
New York University,
wae iote Mert
, 4

Dear Herman,

thanks for your permission to oite your "subtantéal con-
firmation"of Fox & Ward's work. I thought that desirable be-
eause my own first reactions were inoredulousness , and while
without hearing your work in detail I can hardly satisfy
my own mind about it, the atmosphere is cleared by woxd of
confirmation of such spectacular reports.

I am not sure that ~ can help you much on the color of your
extracts. However, don't you think that the molasses is con-

tributing mightily to it? Burkholder (Bull. Torray Bot. Clwb)}

duly '43
deswwibes this medium whieh works fine: (per liter, in gus:)
Asparagine 2, KHAPO, 1.5, NeS0, 25, CaGl,.H5O0 .33;

(WH4) 5504 a a OL eleng at hixtare :ppat

B .O1, Im .01, an "07, Cu .01, Mo .ol, Fe .05,
Add sugary, sterilized separately, as required.
You may also have to ad@ required vitamins- probably thiamin,
inositol, biotin,and pyridoxine.
Reprints were sent under separate caver.

Sinoerely yours,

Joshua Lederberg.