. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 66 C. M. CHILD the differential in the thin layer, if present, is not sufficient to be clearly .visible, except in an apical thickening, as in Figure I, B. In many individuals the cell-wall gradient still seems to be barely visible but it is not consistently distinguishable in all as de- velopment progresses. In general, the cell-wall gradient is most clearly visible in early stages of the indophenol reaction and dye oxidation. As intracellular con- centration of indophenol or dye increases, it becomes progressively less dis
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 66 C. M. CHILD the differential in the thin layer, if present, is not sufficient to be clearly .visible, except in an apical thickening, as in Figure I, B. In many individuals the cell-wall gradient still seems to be barely visible but it is not consistently distinguishable in all as de- velopment progresses. In general, the cell-wall gradient is most clearly visible in early stages of the indophenol reaction and dye oxidation. As intracellular con- centration of indophenol or dye increases, it becomes progressively less distinct, and finally almost or quite indistinguishable. Figure 1, C is a Dendraster exogastrula from a lot subjected to rather extreme change from low to high temperature. This and several other lots were kept after. J K L FIGURE 1. Oxidation patterns of Dendraster excentricus: A, normal blastula; B, normal early gastrula; C-I, LiCl exogastrulae; J-L, sodium azide pre-exogastrulae and early exo- gastrulae. For data concerning experimental conditions see 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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