. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 252 ALLEE, FINKEL, GARNER, EVANS AND MERWIN curve for two concentrations of the extract: 5 X 10~5 mgm. per cc. (triangles) and 5 X 10~6 mgm. per cc. (squares). The broken lines show the appropriate controls in sea water and their mean. Cleavage in this experiment was 96 per cent. The mean difference in percentage cleaved when the accelerated experimentals were at mid-cleavage was 21 per cent. During the 1939 season this extract was tested in dilutions that ranged from 5 X 10~5 to 5 X 10~10 mgm. per cc. Acceleration was PER C
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 252 ALLEE, FINKEL, GARNER, EVANS AND MERWIN curve for two concentrations of the extract: 5 X 10~5 mgm. per cc. (triangles) and 5 X 10~6 mgm. per cc. (squares). The broken lines show the appropriate controls in sea water and their mean. Cleavage in this experiment was 96 per cent. The mean difference in percentage cleaved when the accelerated experimentals were at mid-cleavage was 21 per cent. During the 1939 season this extract was tested in dilutions that ranged from 5 X 10~5 to 5 X 10~10 mgm. per cc. Acceleration was PER CENT 2ND CLEAVAGE ALCOHOL EXTRACT ACCELERATES CLEAVAGE OF ARBACIA EGGS A A - DOSAGE A I - DOSAGE B 50 -so -4O. CONTROLS 10 68 69 MINUTES AFTER FERTILIZATION FIG. 2. Acceleration of second cleavage of Arbacia eggs by treatment with homotypic extracts. See text for details. most effective in the relatively greater concentrations although dilu- tions as great as 5 X 10~9 mgm. per cc. seemed to show an accelerative influence. In the more effective dosages, in the dilutions just noted, in 21 paired experiments, 99 paired comparisons, of which six are shown in Figure 2, indicated that the treated eggs were ahead of their controls. The differences between the percentages of the eggs which achieved second cleavage averaged An analysis for the 99 pairs gave a P-value of less than , a highly 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 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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