. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EGG NUCLEO-CYTOPLASMIC RELATIONS 275 It is to be noted that when the insemination occurs at 78 minutes (time of first polar body formation) or later, the time of second polar body formation remains the same as that of the unfertilized egg. Let us now consider the dotted dash curve which represents the time of first appearance of the sperm aster and which was calculated from data obtained on about 100 eggs observed with an oil immersion objective. The sperm aster never appears until after the second polar body, no matter how
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EGG NUCLEO-CYTOPLASMIC RELATIONS 275 It is to be noted that when the insemination occurs at 78 minutes (time of first polar body formation) or later, the time of second polar body formation remains the same as that of the unfertilized egg. Let us now consider the dotted dash curve which represents the time of first appearance of the sperm aster and which was calculated from data obtained on about 100 eggs observed with an oil immersion objective. The sperm aster never appears until after the second polar body, no matter how early the eggs have been inseminated (the earliest recorded being at 25 minutes). During these earlier OJ I o <D CO O (/) o CL Q o c O) to .a CO. c a> LJ 135 130 120 110 100 90 80 70 <D P 1st Cleavage Sperm Aster 2nd Polar Bod 1st Polar Body. 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 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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