. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 732 Comparative Animal Physiology velopment of pigments of quite different chemical composition, it would ap- pear doubtful that the substances actually become a portion of the chromo- phore molecule. We see from the preceding discussion that in the production and opera- tion of gene hormones we have a most favorable opportunity to investigate in some detail instances of the production and action of hormones in terms of the metabolic transformations proceeding within cells. Molt, Pupation, and Metamorphosis in I
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 732 Comparative Animal Physiology velopment of pigments of quite different chemical composition, it would ap- pear doubtful that the substances actually become a portion of the chromo- phore molecule. We see from the preceding discussion that in the production and opera- tion of gene hormones we have a most favorable opportunity to investigate in some detail instances of the production and action of hormones in terms of the metabolic transformations proceeding within cells. Molt, Pupation, and Metamorphosis in Insects. The post-embryonic de- velopment of insects comprises an orderly series of stages in the course of which the insect becomes transformed from a larva to an adult or imago (Fig. 279). The process involves growth by means of a series of molts, and a metamorphosis in which the larval characters are lost and imaginal ones HEMIMETABOLOUS DEVELOPMENT — " NYMPHAL STAGES , OR Molf / IN8TAH \. Ej. ORTHOPrEHA WalKm^ sticks HEMIPTKH* Bed buj^ OS ON ATA. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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