. The cell in development and inheritance. Cells. 4i8 JMIKRITAXCI- AXn DEVELOrMENT - We now proceed to the consideration of experiments which show that in some animal ^^s such predetermination may go much farther, so that the development does, in fact, show many of the features of a mosaic-work, as maintained by Roux. The best-determined of these cases is that of the ctenophore-egg, as shown by the work of Chun,. Fig. 189. — Partial larvae of the ctenophore Beroc. [Driesch and MORGAN.] A. Half sixteen-cell stage, from an isolated blastomere. B. Resulting larva, with four rows of swimming-p
. The cell in development and inheritance. Cells. 4i8 JMIKRITAXCI- AXn DEVELOrMENT - We now proceed to the consideration of experiments which show that in some animal ^^s such predetermination may go much farther, so that the development does, in fact, show many of the features of a mosaic-work, as maintained by Roux. The best-determined of these cases is that of the ctenophore-egg, as shown by the work of Chun,. Fig. 189. — Partial larvae of the ctenophore Beroc. [Driesch and MORGAN.] A. Half sixteen-cell stage, from an isolated blastomere. B. Resulting larva, with four rows of swimming-plates and three gastric pouches. C. One-fourth sixteen-cell stage, from an isolated blastomere. D. Resulting larva, with two rows of plates and two gastric pouches. E. Defective larva, with six rows of plates and three gastric pouches, from a nucleated fragment of an unseg- mented egg. F. Similar larva with five rows of plates, from above. Driesch, and Morgan ('95), and Fischel ('98). These observers have demonstrated that isolated blastomeres of the two-, four-, or eight-cell stage undergo a cleavage which, through the earliest stages, is exactly like that which it would have undergone if forming part of a com-. 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, bookdecade1900, booksubjectcells, bookyear1906
