摘要: Publisher Summary This chapter discusses the empirical facts about neutralization of viruses and an attempt to derive laws such interactions from known physical principles. Immunological phenomena are divided into binary ternary reactions, according whether only antigen antibody interact or is made compete against another, indicator component system. The elementary act immunology combination antigen. model system chosen rests on large number ways in which these can be assayed broad spectrum antigenic variants within group, range indicators susceptible host animals, extent knowledge pertaining each level interaction. relevant properties virus, antibody, set out sufficient detail serve as basis for subsequent discussion.