. Animal hormones; a comparative survey. Hormones. § ECTODERMAL ENDOCRINE GLANDS OF ARTIIROPODA 137. Wax Fig. 4-6. Experimental method used to test the action of hormones in dia- pausing pupae of the Cecropia silk- worm, Hyalophora. The pupa in front is joined, by a plastic tube up to 3 cm in length, to an isolated abdomen behind. The tube passes at either end through a disc {Di) which closes the cut surface of the abdomen, being sealed in with paraf- fin wax. Windows {W) can be sealed in at either end for observing the onset of differentiation in the internal tissues. This is stimulated
. Animal hormones; a comparative survey. Hormones. § ECTODERMAL ENDOCRINE GLANDS OF ARTIIROPODA 137. Wax Fig. 4-6. Experimental method used to test the action of hormones in dia- pausing pupae of the Cecropia silk- worm, Hyalophora. The pupa in front is joined, by a plastic tube up to 3 cm in length, to an isolated abdomen behind. The tube passes at either end through a disc {Di) which closes the cut surface of the abdomen, being sealed in with paraf- fin wax. Windows {W) can be sealed in at either end for observing the onset of differentiation in the internal tissues. This is stimulated by im- planting a chilled, and therefore activated, brain into the hinder abdomen {Im); prothoracotrophin from the implant causes secretion of ECDYSONE, the moult-promoting hor- mone, from the prothoracic glands in the front specimen {A), which reacts first. Diapause is broken later in the hinder abdomen when it is reached by the haemolymph bearing ecdysone from the front specimen (based on data from Williams, re- drawn after Hinton, 1951). been specifically investigated. Presumptive evidence in favour of such an effect is that both the metaboHc and morphogenetic functions of the glands are carried out simultaneously, so that they could be due to the same prothoracic hormone under the same endocrinokinetic 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 Jenkin, Penelope M. Oxford, New York, Pergamon Press
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjecthormones
