. The cell in development and inheritance. Cells. " ,^,0- â - / ' ^â ^. ' -^ â 1 '^V-^- â â .. 0-ir 'lo , â ''5^?? /vf;y;; ,::^ â 'â¢'â â / â >â '.â â Z'.' ^rTc 1 - M.'' ^ 'â '.' : '.; 'â '«','';â '.' â â â -; â /" '^ '.â 'â¢â â¢J ^K;'^. XJ â¢â¢â â¢â .'r>l?.; ;â¢;...â¢â¢' V.' Fig. 150.â Formation de novo (?) of centrosomes. ]^A, B, MEAD; C. Morgan.] A. Unfertilized egg of Oiirtopterus with " secondary asters " developed a few minutes after the egg is placed in sea-water. B. Slightly later stage with tVvo definitive polar asters and centrosomes. C. Large "su
. The cell in development and inheritance. Cells. " ,^,0- â - / ' ^â ^. ' -^ â 1 '^V-^- â â .. 0-ir 'lo , â ''5^?? /vf;y;; ,::^ â 'â¢'â â / â >â '.â â Z'.' ^rTc 1 - M.'' ^ 'â '.' : '.; 'â '«','';â '.' â â â -; â /" '^ '.â 'â¢â â¢J ^K;'^. XJ â¢â¢â â¢â .'r>l?.; ;â¢;...â¢â¢' V.' Fig. 150.â Formation de novo (?) of centrosomes. ]^A, B, MEAD; C. Morgan.] A. Unfertilized egg of Oiirtopterus with " secondary asters " developed a few minutes after the egg is placed in sea-water. B. Slightly later stage with tVvo definitive polar asters and centrosomes. C. Large "sun" (transformed polar aster) containing numerous small "secondary asters" and centrosomes, from unfertilized egg of Cerebratulns after 22 hours in % sodium chloride solution. water or treated by weak solutions of sodium or magnesium chloride. These asters often contain deeply staining, central granules indistin- guishable from the centrosomes of the normal asters ; and, what is of high interest, such of them as lie near the nucleus take part in the irregular nuclear division that ensues, forming centres toward which the chromosomes pass. These divisions continue for some time, the chromosomes being irregularly distributed through the &g^, and giving rise to nuclei of various sizes apparently dependent upon the number of chromosomes each receives. After a variable number of such. 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 Wilson, Edmund B. (Edmund Beecher), 1856-1939. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcells, bookyear1911
