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activity addition Advancement American American Chemical Society animal annual appear application appointed assistant Association atom awarded become biological California cent chairman changes chemical chemistry College committee Company complete containing continue cosmic ray course determined direction director discussed Division effect electrical engineering existence experimental experiments fact field Foundation given held human important increased individual industrial Institute interest John laboratory material mathematical means Medicine meeting ment method Michigan Museum natural observed obtained organ particles physical plants position possible present president problems produced professor psychology recent relation School scientific September session social Society solution species structure theory tion tissue United University of Chicago various virus vitamin York