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SIX FIGURESThe immunochemical aspects of antibody (Ab) formation have received considerable attention recently. Theories have been proposed explaining, primarily in biochemical terms, how an antigen ( A g ) stimulates protein synthesis, how the remarkable specificity of the Ab is developed, how Ab formation is continued long after Ag injection, how Ab formation is depressed by X radiation and other agents, and how the Ab is released into the blood. Frequently these theories and their supporting evidence have been considered as involving one static cell type that presumably ingests or absorbs the Ag, synthesizes the Ab, actively releases it, and then returns to a resting state (Breinl and Haurowitz, '30 ; Alexander, '32 ;

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