THE LONG ISLAND JEWISH HOSPITAL QUEENS HOSPITAL CENTER AFFILIATION —sossoe 102595 82-68 764th ST. + JAMAICA, NEW YORK 11432 * JA 6-8600 May 5, 1966 Mr. William E. Siri University of California Donner Laboratory & Donner Pavilion Berkeley 4, Calif. Dear Will: Each of the samples of plasma which I sent you was preserved with a few grains of mercuric chloride. This was the only preservative agent that we had available to us and may be responsible for the paste-like appearance. I hope you can find someone who is enough of a chemist to dissolve this coagulum so that the samples can be counted. There should be more than 2 ml in each of these samples. With kindest regards, Sincerely yours, THE LONG ISLAND JEWISH HOSPITAL QUEENSROS PITAL CENTER AFFILIATION f LMM/b js Leo M. Meyer, M.D. Hematologist in Charge