. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 242 T. H. MORGAN. normal spermatogenesis had started and all the stages, from the spermatogonia to mature spermatozoa, could be observed in the slides. The spermatozoa finally degenerate and this is probably due to the lack of an outlet in the organ. New tubules are aris- ing near the surface of the section. The clusters of luteal cells, however, have apparently disappeared, their place being taken by the ordinary connective tissue and an enormous number of small lymphocytes which are arising in the intertubular tissue at th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 242 T. H. MORGAN. normal spermatogenesis had started and all the stages, from the spermatogonia to mature spermatozoa, could be observed in the slides. The spermatozoa finally degenerate and this is probably due to the lack of an outlet in the organ. New tubules are aris- ing near the surface of the section. The clusters of luteal cells, however, have apparently disappeared, their place being taken by the ordinary connective tissue and an enormous number of small lymphocytes which are arising in the intertubular tissue at this time. Some of these small lymphocytes become transformed into large wandering cells which usually occur in the testis of both hen- and cock-feathered birds. The disappearance of the ! ). FIG. 9. Cock-feathered, normal cock and hen, from Wright's " Xew Book of ; luteal cells may be accounted for by the failure of this tissue to regenerate owing to its more or less abnormal condition at the time of castration. If some of the cells found in the sections are really luteal cells their numbers are probably too small to induce any change in the characteristics of the plumage. The relatively large size of the comb in the ' larger' bird, on the other hand, may be due, even in the case in which a very small. 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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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
