. The embryology of the honey bee. Honeybee; Bees. THE EMBRYOLOGY OF THE HONEY BEE 165 each (Fig. 55, DegCl). Degenerating cells become evident in these regions as early as Stage IX, and are easily recognizable at low magnifications by the presence among the brain cells of deeply stained granules. Under a high magnification these gran- ules prove to be the remains of the chromatic contents of the nuclei of degenerating cells (Fig. 62). Such nuclei are spherical. _ Fig. 62. Part of the section represented by fig. 56, showing degenerat- ing cells in the protocerebrum, x 600. in form and smaller
. The embryology of the honey bee. Honeybee; Bees. THE EMBRYOLOGY OF THE HONEY BEE 165 each (Fig. 55, DegCl). Degenerating cells become evident in these regions as early as Stage IX, and are easily recognizable at low magnifications by the presence among the brain cells of deeply stained granules. Under a high magnification these gran- ules prove to be the remains of the chromatic contents of the nuclei of degenerating cells (Fig. 62). Such nuclei are spherical. _ Fig. 62. Part of the section represented by fig. 56, showing degenerat- ing cells in the protocerebrum, x 600. in form and smaller than the adjacent nuclei, the nuclear mem- brane often faint. The chromatin generally appears to be con- densed into one or more relatively large granules, and large and deeply-stained spherical nucleoli are also commonly present. Janet (1907) has observed very similar nuclei in the degenerating wing muscles of an ant (Lasius). The cytoplasm of the degen- erating cells becomes broken up into a number of minute spherules, producing an appearance suggestive of an emulsion (Fig. 62). This process of cell degeneration continues up to the time of hatching, and probably even later, but the number of degenerating cells present in the brain reaches its maximum at Stages XIII and XIV (Figs. 56 and 62). At this time not only do the regions referred to appear to be crammed with degenerating cells, but a large number of the superficial cells of the protocerebral lobes, as far back as the optic lobes, are also in a state of 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 Nelson, James Allen. Princeton : Princeton University Press
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectbees, bookyear1915
