. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. VISCOSITY CHANGES, AGEING EGGS OF ARBACIA 201 tion or whether extreme liquefaction occurred first, followed quickly by coagulation. These five phases are diagrammatically represented in Fig. 6. Extent of Change.—These viscosity changes are greater than those which occur under a variety of other conditions, hut comparisons are not readily made, either hecause the changes have not been given quantitatively or because different units have been used. In Table II such a comparison is attempted. This table shows that viscosity in-
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. VISCOSITY CHANGES, AGEING EGGS OF ARBACIA 201 tion or whether extreme liquefaction occurred first, followed quickly by coagulation. These five phases are diagrammatically represented in Fig. 6. Extent of Change.—These viscosity changes are greater than those which occur under a variety of other conditions, hut comparisons are not readily made, either hecause the changes have not been given quantitatively or because different units have been used. In Table II such a comparison is attempted. This table shows that viscosity in- '1 r Centrifuge Min. 6. 0 Unripe Eggs 10 15 20 Ageing Ripe Eggs 25 30 35 40 45 Hrs. Dead Eggs FIG. 6. Diagrammatic representation of the five phases in viscosity of the egg, viz. I. All unripe eggs at any age, extremely viscous. II. Maturation, extreme and rapid liquefaction. III. Ripe eggs, early and intermediate ages, progressively increased viscosity. IV. Ripe eggs, late ages, much deterioration, progressive liquefaction. V. Dead eggs, coagulation. creased during mitosis of Arbacia eggs by two-thirds. Larger changes occurred with temperature, HC1, NH4OH, ultraviolet light, etc., viz., 21/4 to 4 x. The largest change heretofore described occurred during mitosis of Cuinnujia eggs, viz., 5 to 8x. During ageing of Arbacia eggs, there were both positive and negative changes of 2 to 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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