Abstract
Effects of corpus allatum hormone (JH) on the growth and differentiation of the internal organs of Galleria larvae were investigated. Some of the internal organs develop continuously, others only for a period in each larval instar. They maintain larval form until the second third of the last larval instar or later and then differentiate towards the imaginal form. Differentiation appears as a continuous process of changes based mostly on degeneration of some parts and more profound growth of the others, which may be interrupted at most points by JH. In this way insects with internal organs intermediate between larval and imaginal structure result. The overall growth of the organs continues after hormone application but at a different rate. Slight morphological change in wing disks which appears in the penultimate larval instar may be also prevented by JH.
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