. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. c a> LJ 135 130 120 110 100 90 80 70 <D P 1st Cleavage Sperm Aster 2nd Polar Bod 1st Polar Body. 25 40 55 70 85 100 115 Time of Insemination in Minutes Subsequent to Deposition in Sea Water FIGURE 1. Relation of time of insemination to time of appearance of first , second , and first cleavage (solid lines), and of sperm aster (dotted dash line). Faint dotted horizontal lines represent times of appearance in unfertilized eggs of first and second The observations were made on eggs of Asterias forbcsii at 16°
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. c a> LJ 135 130 120 110 100 90 80 70 <D P 1st Cleavage Sperm Aster 2nd Polar Bod 1st Polar Body. 25 40 55 70 85 100 115 Time of Insemination in Minutes Subsequent to Deposition in Sea Water FIGURE 1. Relation of time of insemination to time of appearance of first , second , and first cleavage (solid lines), and of sperm aster (dotted dash line). Faint dotted horizontal lines represent times of appearance in unfertilized eggs of first and second The observations were made on eggs of Asterias forbcsii at 16° C. stages of the developing egg, it appears at two to three minutes after the second polar body has been given off. In later stages, viz., after 70 minutes, this interval becomes progressively greater. It is to be noted that the interval between the time of appearance of the sperm aster and the time of first cleavage is always just about 68 minutes, whether the time of insemination is early or late. This is the normal time for the events following aster appearance. The length of the interval between the time of insemination and the time of sperm aster appearance varies, depending upon the state of maturation of the karyocytoplasm. It becomes con-. 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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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
