. The cell in development and inheritance. Cells. '1\ I \ y^ B \. D Fig. 32. — Mitosis in Stypocaulon. [Swingle.] A. Early prophase with single aster and centrosome. B. Initial formation of intranuclear spindle. C. Divergence of the daugliter-centrosomes. D. Early anaphase; nuclear membrane still intact. its substance. Here, therefore, it is impossible to speak of a " cen- tral ; It is nevertheless probable that the spindle-fibres are of two kinds, viz. continuous fibres, w^hich form the interzonal fibres seen during the anaphases, and half-spindle fibres, extending only from
. The cell in development and inheritance. Cells. '1\ I \ y^ B \. D Fig. 32. — Mitosis in Stypocaulon. [Swingle.] A. Early prophase with single aster and centrosome. B. Initial formation of intranuclear spindle. C. Divergence of the daugliter-centrosomes. D. Early anaphase; nuclear membrane still intact. its substance. Here, therefore, it is impossible to speak of a " cen- tral ; It is nevertheless probable that the spindle-fibres are of two kinds, viz. continuous fibres, w^hich form the interzonal fibres seen during the anaphases, and half-spindle fibres, extending only from the poles to the chromosomes. It is possible that these two kinds of fibres, though having the same origin, respectively corre- 1 Cf. Platner ('86) on Arion and LepiJoptera, Watase ('91) on Loligo, Braus ('95) on Triton, and Griffin ('96, '99) on Thalasseina. Erlanger ('97, 5) endeavours to show that in the mitosis of embryonic cells in the cephalopods (^Sepia), where the inpushing of the mem- brane was previously shown by Watase, the entire spindle arises from the nucleus. G. 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
