September 29, 956 Mr. Fred J. Mann, President Mann Research Laberatories 136 Liberty Street New York 6, N. Y. Dear Mr, Mann: This ig te confirme that Dr. Jeshua Lederberg has accepted te act aga our representative according te my letter ef July 20, 1956. He wag supposed te place orders through your Company and te receive 20 % of the sale prices. Please contact Dr. Lederberg directly at the Genetics Department, University of Wisconsin, Madison, Wisconsin, and explain him about his duties as ropresentative. I received your letter of September 18 with the information en the price situatien ef ONPG. I de not know what quality the ONPG of California Foundation is, at any rate the difference in their prices and ours is not so large. I will consult my partners ( who still have interest in the stock ef ONPG you have in hand) te decide shortly on the matter. This Institute wants to purchase 1 gram of ONPG for teaching a pest-graduate ceurse in a couple of weeks. Because of the red tape it will be almost impessible te have a purchasing order in your hands on tine. ‘herefore if yeu ceuld send the ONPG and bill it later they will be very grateful, I will be respensible fer the payment in any case. Phe erder has to go to: c/e Dr, Cabelle. With best personal regards, Sincerely yours ot fo ; Cepy Dr. Lederberg