the U.S. Navel Radictssical tefense Usiocatory. 1949-58 he spent a year at Argonne National Laboratory, working in the laboratory of Harvey Patt. During this year Dr. Conard made significant and lasting contributions on the effect of radiation upon the motility of the gut. We take it for granted today that radiation effects are primarily mediated through ceil death, interference with cell proliferation and mutagenesis >but in the 40's and 50's there was a lot of mysticism about radiation effects being mediated by various toxins, From 1951-55 Dr. Conard servec with me in the Hematology Div&sion of Naval Medical Research Institute, During this interval he made further valuable contrisutions to the physiclogy of che gut and effects of radiation thereon. Drs. Bond, Conard and 1 participated in severait atomic bomb field tests at the Pacific and Nevada Test Sites. A surprising amount of basic and applied rasearch cesulted from these studies that, though relevant to military operations, contributed arichly to our understanding of effects cof radiation and RBE of fission neutrons. After detonation of an approximate 15 megaton nuclear device on March 1, 1954, a fallout accident occurred--perhaps it should be