. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 22 FIGS. 22, 23 and 24. Spermatogonium, spermatocyte and spermatid from mouse testis fixed in formalin and bichromate (Regaud IVJ3) and stained with iron hema- toxylin. Note diffuse arrangement of mitochondria, circumnuclear condensation and final diffuse arrangement. (1,500 diameters.) In animal cells they are almost invariably disposed in a radial fashion about the centrosome: contrasting strongly with their appearance in Pustularia during spore formation when they are entirely absent from the region near the centrosome an
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 22 FIGS. 22, 23 and 24. Spermatogonium, spermatocyte and spermatid from mouse testis fixed in formalin and bichromate (Regaud IVJ3) and stained with iron hema- toxylin. Note diffuse arrangement of mitochondria, circumnuclear condensation and final diffuse arrangement. (1,500 diameters.) In animal cells they are almost invariably disposed in a radial fashion about the centrosome: contrasting strongly with their appearance in Pustularia during spore formation when they are entirely absent from the region near the centrosome and are found in a clump in the portion of the cells farthest away from it (Guilliermond, '136, p. 649). No examples of a radial arrange- ment have to the best of my knowledge been described in the higher plants but this may be due to the well-known absence of a typical centrosome in the Angiosperms. It will be noticed that in animal cells rather more variations obtain in the arrangement of mitochondria than in plant cells, but this seems to be correlated in some way with the fact that animal cells are more generally polarized. I mean polarized for irritability, conduction, secretion, contraction and so forth, properties which do not play so great a role in the life of plants, where separate regions of the cell are not so distinctly marked off. Accordingly if one were searching for variations in the distribu-. 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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