It was found and reported previously that the red cell cholinesterase of hemolysed and reinjected blood disappeared within 15 minutes from the plasma of a normal lamb. This experiment was repeated with several intra- venous injections of india ink during the week preceding the transfusion. all of the cholinesterase was gone from the plasma within 15 minutes. revealed a coal-black liver and spleen. any certainty at present. Again, Autopsy This finding cannot be interpreted with Although the appearance of the organs suggested that blocking of the reticuloendothelial system was probably largely complete; Bo <, cannot be stated from this experiment,thetatttae Ree ile to phagoc authority of the fragments of red cells presented to it. 2. Per A Biophysies Section (E, Cir syrderes the mx, U.S.E. << ize A.» y9 Ln izing/change i ycl Py(Cap Cea a.__Monkey Counter,(% Toe ey Cop peaserseah—ins changa, ard date) The pulse height has not chansed over the past month, following the initial decline previously reported. Since the present pulse height is adequate, no further investigation of this effect is planned. been moved to the H-5 counting room in the basement. The detector has A suitable lucite cage for holding the monkeys while counting has been constructed. b. 7,E. Ion Chambers. (J. Savezg, J. Larkins): Herald Rossi spent several days with us testing the prototype chambers for the Nevada tests. be rectified by redesign. Several difficulties were uncovered which will -Tests were conducted using both 250 KVP X ray and fission neutrons from Godiva. In the latter experiments Godiva was operated as a reactor and at bs Usec burst levels. "Under all conditions the chambers failed to give adequate measurement of radiation dose. The graphite pile has been moved to the source room‘in the base- ment because of the pending construction in the sub-basement, Tests on premixing of tissue equivalent gases indicate that there will be no fractionation on filling the chambers. Wt ae / 7