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activity addition Advancement Agricultural American animals annual appear applied appointed assistant Association become biological California cells cent changes chemical chemistry College committee complete containing continued contributions course culture determined direction director discussion disease Division effect electric engineering experimental experiments fact field forest give given growth Health held human important increase industrial Institute interest International John knowledge laboratory light living material mathematical means measurements mechanics Medical medicine meeting ment method Michigan nature observed obtained organization period physics plant position possible practice present president problems production professor recent relation reported School scientific secretary session showed Society solution species structure theory tion United University various York