. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 336 STEFAN KOPEC. grafted an analogous germ derived from a full-grown caterpillar, which was to undergo metamorphosis in a few days. In two of the caterpillars somewhat large and black outgrowths—dwarfed and deformed wings—appeared on the place of grafting, 'in their uniformly dark hue and the thickness and markings of the chitin they formed a striking contrast to the bright-colored tegument of the caterpillar. (Cf. Fig. D.) The small size and the abnormal. FIG. D. forms were doubtless caused by inevitable injuries of the de
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 336 STEFAN KOPEC. grafted an analogous germ derived from a full-grown caterpillar, which was to undergo metamorphosis in a few days. In two of the caterpillars somewhat large and black outgrowths—dwarfed and deformed wings—appeared on the place of grafting, 'in their uniformly dark hue and the thickness and markings of the chitin they formed a striking contrast to the bright-colored tegument of the caterpillar. (Cf. Fig. D.) The small size and the abnormal. FIG. D. forms were doubtless caused by inevitable injuries of the delicate germ during transplantation, as well as by the difficulty of extract- ing the pupal wing from the moulting but not pupating caterpillar. Histologically the development of the pupal wings was normal. I have also formerly observed (Kopec, 'n) that the sexual glands of full-grown caterpillars develop at their normal rate when grafted on the caterpillar after their third or fourth moult. Such a be- havior of the grafted wings and sexual glands strikingly confirmed the above-stated principle that after the time when the brain has already exerted its influence on the whole organism—which influ- ence decides the inception of histolytical processes leading to the chrysalis stage—the subsequent development and metamorphosis of organs is quite independent of the brain. The results of my experiments proved that the rate of develop- ment of the grafted organs underwent no change due to the in- fluence of new surroundings, differing both as to age and physio- logical state. These results seem to disagree with analogous re- searches of Uhlenhuth ('12, '13) on amphibians. This author grafted eyes of salamander larvae on specimens of a different age and came to the conclusion that the metamorphosis of the trans- planted eyes underwent a distinct retardation when grafted on. Please note that these images are extracted from scanned page images that may have been digitally enhanced
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
