. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 376 A. J. GOLDFARB. there occurred a direct diminution with age. In this group belong females 10 and n, and probably female 7. It should be recalled that the physiologic condition of any set of eggs was not determined merely by egg size, but by the results of several tests, such as the jelly layer test, the membrane test as well as the cleavage test, etc. By all of these tests, it was clearly. and definitely shown that eggs in good physiologic condition at the time of liberation, increased steadily with age, within the limit
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 376 A. J. GOLDFARB. there occurred a direct diminution with age. In this group belong females 10 and n, and probably female 7. It should be recalled that the physiologic condition of any set of eggs was not determined merely by egg size, but by the results of several tests, such as the jelly layer test, the membrane test as well as the cleavage test, etc. By all of these tests, it was clearly. and definitely shown that eggs in good physiologic condition at the time of liberation, increased steadily with age, within the limits shown in Table I., and subsequently diminished in size by a process of fragmentation described in Part III. Eggs in physiologically Max. Age of eggs in hours. Physio'ogic good eggs poor bad ' Fresh ' Moderately aged Very aged FIG. i. Extent of morphologic and physiologic change in aging or deteriorating eggs. .4', B, C, D, E, F, represents the change in volume, rate of membrane formation, rate of cleavage, total cleavage (Hipponoe). A, B, C, D, E, F, repre- sents the change in width of fertilization membrane, loss of jelly, total cleavage, etc. .4', B is period of superripening; B, C, D, the period of overripening or deterioration; D, E, F, the period of extreme deterioration or dying of the eggs. poor condition at the time of liberation behaved like half-aged eggs, that is, they either enlarged but little, or did not enlarge at all, and subsequently diminished to and below the norm of the Figure I represents graphically and schematically the change 1 So constant is the relation between volume and physiologic condition, tha one can predict the one from the other, with remarkable 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. ); Ma
Size: 2117px × 1180px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
