. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. D. H FIG. 2. All figures are of Allosphccrium during binary fission. The figures represent optical sections of stained organisms drawn with the aid of the camera lucida. X 990. A. Resting stage. The macronuclear chromatin in the form of a coarse reticulum. Schaudinn-Feulgen. B. Formation of the central chromatin ball. The shell of reticular chromatin is shown only at the edges in this optical section. Flemming-Heidenhain. C. Contraction of central ball. Note the concentration of reticular chromatin at poles. Schaudi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. D. H FIG. 2. All figures are of Allosphccrium during binary fission. The figures represent optical sections of stained organisms drawn with the aid of the camera lucida. X 990. A. Resting stage. The macronuclear chromatin in the form of a coarse reticulum. Schaudinn-Feulgen. B. Formation of the central chromatin ball. The shell of reticular chromatin is shown only at the edges in this optical section. Flemming-Heidenhain. C. Contraction of central ball. Note the concentration of reticular chromatin at poles. Schaudinn-Feulgen. D. Elongation of macronucleus. Daughter micmnuclei below the level of focus. Flemming-Heidenhain. E. Constriction stage. Most of the rt-ticular chromatin in bands near the di- vision plane. Flemming-Heidenhain. F. Later stage. The central ball has become loosened and spread out between the future daughter macronuclei. Schaudinn-Feulgen. G. Separation stage. Schaudinn-Feulgen. H. Macronuclear division completed. The central ball is cast into the cyto- plasm, in this case, of the anterior daughter. Schaudinn-Feulgen. it, separating it from the shell of unchanged reticular chromatin (Fig. 2, B). At this time the activity of the micronucleus is evidenced by an increase in size and by dispersal of its chromatin as fine 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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