. Contributions to embryology. Embryology. THE MITOCHONDRIAL CONSTITUENTS OF PROTOPLASM. 75 During cell division the mitochondria are distributed in much the same way in plants as in animals. They persist during the whole process; they are absent in the spindle area, whether a definite spindle be formed or not; and they are divided in approximately equal amounts between the two daughter-cells. But in minor respects their distribution varies more in animals. I have reference, for instance, to the mitochondrial palisade described by Benda (1902, p. 781) in Blaps, which is (so far as I know) unkn
. Contributions to embryology. Embryology. THE MITOCHONDRIAL CONSTITUENTS OF PROTOPLASM. 75 During cell division the mitochondria are distributed in much the same way in plants as in animals. They persist during the whole process; they are absent in the spindle area, whether a definite spindle be formed or not; and they are divided in approximately equal amounts between the two daughter-cells. But in minor respects their distribution varies more in animals. I have reference, for instance, to the mitochondrial palisade described by Benda (1902, p. 781) in Blaps, which is (so far as I know) unknown in plants. In animal cells they are almost invariably disposed in a radial fashion about the centrosome, but such a condition has, to the best of ni}' knowledge, not been described in plants. This discrepancy maj^ however, be due to the well-known absence of a typical centrosome in the angio- sperms. Kingsbury (1912, p. 45) makes the interesting suggestion that (since in the terms of Lillie's theory of cell division the centrosome is a negative center) the mitochondria, being reducing substances, carry a positive charge and accumu- late around the centrosome in order to discharge it. In the cells which are not dividing the mitochondria sometimes heap ui^ about the centrosome and sometimes do not. Their behavior may indicate whether the centrosome is 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 Carnegie Institution of Washington. Washington, D. C
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