. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ©.-CONSUMPTION OF ASTERIAS EGGS 471 the abscissa, the time in minutes after the closing of the manometers. The values for the fertilized eggs with sperm are plotted as line A, those for the unfertilized eggs, B; and those for the sperm, C. The broken line D is the corrected curve for the fertilized eggs minus the sperm, , A-C, which falls closely on the curve for the unfertilized eggs. In some of the experiments, for reasons yet obscure, over 80 per cent of the unfertilized eggs remained immature after three hours in the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ©.-CONSUMPTION OF ASTERIAS EGGS 471 the abscissa, the time in minutes after the closing of the manometers. The values for the fertilized eggs with sperm are plotted as line A, those for the unfertilized eggs, B; and those for the sperm, C. The broken line D is the corrected curve for the fertilized eggs minus the sperm, , A-C, which falls closely on the curve for the unfertilized eggs. In some of the experiments, for reasons yet obscure, over 80 per cent of the unfertilized eggs remained immature after three hours in the respirometers although controls in Syracuse watch glasses gave a high percentage of maturation. Like the mature eggs, their rate of oxygen consumption is constant, and for the first hour in the respirom- eters it is equal to those of the mature and fertilized eggs, becoming slightly lower after the second hour. The absolute rates of oxygen consumption (Qo^) for these eggs of the second series during the first hour in the respirometers expressed in terms of cubic millimeters per hour per million eggs (the number being obtained by hemocytometer counts) are: immature, 168; mature, 170; and fertilized, 167. Thus it appears that the rate of oxygen consump- tion for the Asterias eggs is the same whether mature, immature, or fertilized. Their rate is of the same order of magnitude as that for the fertilized Arbacia eggs, and is five times that of the unfertilized (Tang, 1931). If we take into consideration the diameter of the unfertilized Arbacia eggs (74 micra) and that of the unfertilized Asterias eggs (160 micra), we obtain a ratio of 1 : On squaring, it becomes 1 : , which is the ratio of the Qo2, of these eggs, indicating that when ex- pressed in terms of amount of oxygen consumed per unit surface, the Qo2 of the two unfertilized eggs agree. Such a relation fails to hold in the case of the fertilized eggs. I wish to express my sincere gratitude to Professors R. S. Lilli
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
