. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 3. Results of Experiment 2 showing the average percentage of the testis occupied by the various germ cells. Refer to the text for the experimental conditions of the groups. Key: 1, Spermatogonia. 2, Spermatocytes. 3, Sperma- tids. 4, Sperm. 5, Evacuated cysts. 6, Non-germinal. Experiment III.—The next series of experiments were made during the winter months to find if a steadily increasing light period would have any influence on either gametogenesis or on sperm discharge with tem- peratures at approximately the thres
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 3. Results of Experiment 2 showing the average percentage of the testis occupied by the various germ cells. Refer to the text for the experimental conditions of the groups. Key: 1, Spermatogonia. 2, Spermatocytes. 3, Sperma- tids. 4, Sperm. 5, Evacuated cysts. 6, Non-germinal. Experiment III.—The next series of experiments were made during the winter months to find if a steadily increasing light period would have any influence on either gametogenesis or on sperm discharge with tem- peratures at approximately the threshold value for germinal activity. The threshold temperature was considered to approximate 15° C. as temperatures just helow were inhibitory, while under natural conditions breeding begins at this temperature. The 59 newts collected on Novem- ber 3, 1939, were kept at temperatures averaging 15° C. until February 7 when they were placed in the experimental groups listed below. An additional 21 animals collected on February 6 were included in the 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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