. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 158 TI-CHOW TUNG, SU-HWEI KU AND YU-FUNG-YEH TUNG of the eggs of both sets occurred at the same time, regardless of the rate and duration of centrifuging. It took place usually in about one hour and a half after insemination, much later than the records of other authors. Such delayed cleavage may be due to the low temperature of the sea water at SO p Q o fe^^ty ;-W, .•'\>V. y-t^rt:-rv " '"*-V ' Q-**-"~ •" -rSo ' ' '-. - " A ^Blfe^MPISfl^Sl^ft ^l§^^^^^^^ ,^P-°:Oo:CXp^-o- , 0° no°bnP^-&am
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 158 TI-CHOW TUNG, SU-HWEI KU AND YU-FUNG-YEH TUNG of the eggs of both sets occurred at the same time, regardless of the rate and duration of centrifuging. It took place usually in about one hour and a half after insemination, much later than the records of other authors. Such delayed cleavage may be due to the low temperature of the sea water at SO p Q o fe^^ty ;-W, .•'\>V. y-t^rt:-rv " '"*-V ' Q-**-"~ •" -rSo ' ' '-. - " A ^Blfe^MPISfl^Sl^ft ^l§^^^^^^^ ,^P-°:Oo:CXp^-o- , 0° no°bnP^-& ., °.° G °'°. QOO:, - °.a°r %$£&&& 8 .50 FIGS. 6 and 7. Sections of eggs centrifuged for ten minutes at 2193 times gravity and fixed one hour after fertilization, showing the positions of the sperm aster, the polar body (Fig. 6) or second maturation spindle and the mitochondria crescent. There are no constant relations between them. FIG. 8. Section of an egg centrifuged in capillary tube for one hour and twenty-four minutes and fixed forty minutes after fertilization. The sperm aster is in the yolk zone; no mitochondria surround it. The pattern of the cleavage planes of the centrifuged eggs differed in no essential respect from those of normal eggs. The first two cleavage planes were perpendicular to each other, while the third plane was at right angles to both of the first two, resulting in the formation of four micromeres and four macromeres. However, the first two cleavage planes did not always pass through the point of attachment of the polar bodies. After prolonged centrifuging, there was a significant. 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 Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 190
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
