. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CARBON DIOXIDE AS A NARCOTIC AGENT. 455 in CO2 as compared with solutions I and 4. The first cleavage appeared as shown in Fig. I, where it will be seen that the shortest cleavage time occurred with the sea water control, represented by Curve i. A lowering of the oxygen tension to slightly over one tenth of the normal value retarded the cleavage time but 4 minutes PER CENT 100 75 5O. _L 30 6O 90 120 15O MIN. FIG. i. The relative effectiveness of low oxygen tensions and high CO2 tensions in delaying the first cleavage of Arba
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CARBON DIOXIDE AS A NARCOTIC AGENT. 455 in CO2 as compared with solutions I and 4. The first cleavage appeared as shown in Fig. I, where it will be seen that the shortest cleavage time occurred with the sea water control, represented by Curve i. A lowering of the oxygen tension to slightly over one tenth of the normal value retarded the cleavage time but 4 minutes PER CENT 100 75 5O. _L 30 6O 90 120 15O MIN. FIG. i. The relative effectiveness of low oxygen tensions and high CO2 tensions in delaying the first cleavage of Arbacia eggs. Exposures were of thirty minutes' duration. Temperature, °°. Abscissa = time, in minutes, after insemination. Ordinate = percentage of eggs showing the first cleavage. Symbol. Curve i O Circles Curve 2 X Crosses Curce 3 • Dots Curve 4 A Triangles cc. Oxygen. per Liter. 5-15 0-55 C02. 60% 60% (Curve 4). On the other hand, an increase of the CO2 content to give pH of was sufficiently great to retard the cleavage time 36 minutes, irrespective of the oxygen present, since a single curve serves to represent cleavage in the two solutions which, although showing more than a 4: i difference in oxygen content, had the same carbon dioxide content. Since from such experiments as. 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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