The body cells of the developing insect carry the potentialities for both larval and imaginal differentiation. During larval life imaginai differentiation is suppressed because in the presence of the juvenile hormone (sometimes referred to as the ‘inhibitory hormone’), secreted by the corpus allatum, the intracellular system which leads to the formation of larval structures takes precedence over the system which leads to the formation of adult structures (Wigglesworth, 1940).
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V. B. Wigglesworth (1952) studied this question.
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