. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CLEAVAGE-ACTIVATION RELATION 53 three dishes examined, sixteen exceptions were found, all of them in dishes showing less than 8 per cent activation. The increase in activation occurs much more rapidly than the decrease. This may readily be seen in the graph (Fig. 1), where the percentage of activation plotted against time gives a skew curve. The probable interpretation of this result will be presented later. But in connection with the activation-time curve, it is of interest to 90 BO -tl- II-J ~50 20 50%. FIG. 2. Variation o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CLEAVAGE-ACTIVATION RELATION 53 three dishes examined, sixteen exceptions were found, all of them in dishes showing less than 8 per cent activation. The increase in activation occurs much more rapidly than the decrease. This may readily be seen in the graph (Fig. 1), where the percentage of activation plotted against time gives a skew curve. The probable interpretation of this result will be presented later. But in connection with the activation-time curve, it is of interest to 90 BO -tl- II-J ~50 20 50%. FIG. 2. Variation of percentage activation (open circles), percentage cleavage (solid circles) and mean volume of eggs (continuous curve) with length of exposure to 50 per cent sea water. Data of Table VI. present here the curve showing the increase in volume with length of exposure to the 45 per cent sea water. The data from which the curve was drawn are given in Table V. Each point represents the average of the volumes of three eggs. The measurements of the diameters were made with a Filar ocular micrometer. With this micrometer measurements accurate to per cent may be obtained. However, the variations in volume, for the data presented here and below, ranged as high as 5 per cent. This is probably due to the rapid change in volume that is taking place as the measurements are made and to the variability of the eggs. The volume measurements are being repeated on a larger scale and by means of a cinematograph in order to obtain accurate data for an analysis of the swelling process itself. But even the relatively rough data presented here will be shown to be useful in an analysis of the activation-time curves obtained in these 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 Marine Biological Laboratory (Woods H
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
