. The cell in development and inheritance. Cells. THE CENTROSOME 355 piece (p. 212), which is itself genetically related to the centrosome of the last cell-generation (p. 170). These facts seem explicable only under the assumption that in these cases the centrosome, or a sub- stance which it carries, gives an active stimulus to the cytoplasm which incites the aster-formation about itself, and in the words of Griffin " disengages the forces at work in mitosis " ('96, p. 174). For these reasons I incline to the view that in the artificial aster-formation described by Morgan ^ the centr
. The cell in development and inheritance. Cells. THE CENTROSOME 355 piece (p. 212), which is itself genetically related to the centrosome of the last cell-generation (p. 170). These facts seem explicable only under the assumption that in these cases the centrosome, or a sub- stance which it carries, gives an active stimulus to the cytoplasm which incites the aster-formation about itself, and in the words of Griffin " disengages the forces at work in mitosis " ('96, p. 174). For these reasons I incline to the view that in the artificial aster-formation described by Morgan ^ the centrosomes there observed should not be regarded as the creations of the asters, but rather as local deposits of material which incite the aster-formation around them. That the centrosomes or astral centres are centres of division (whether active or passive) is beautifully shown by Boveri's interesting observations on " partial fertilization " referred to at page 194. Again, Boveri has observed that the segmenting ovum of Ascaris sometimes contains a supernumerary centrosome that does not enter. 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
