Although considerable progress has been made with the chemistry of juvenile hormone (Dahm, Roeller & Trost, 1968), studies on its mechanism of action in immature insects are still in a preliminary stage. Much of the recent work has been interpreted as showing an effect of juvenile hormone on the morphogenetic program through which an insect passes in the course of its ontogeny (Williams, 1961). It is the purpose of this paper to describe three studies which illustrate the complex nature of this developmental program in saturniid moths.
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Judith H. Willis (1969) studied this question.
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