. The cell in development and inheritance. Cells. B D. ..-f^f^^^H ."^\ F ^ Fig. 148. — Mitosis witli intra-nuclear centrosome, in the spermatocytes o{ Ascaris megalo- cephala, var. univalens. [Brauer.] A. Nucleus containing a quadruple group or tetrad of chromosomes (/), nucleolus {n^, and centrosome (t). Division of the centrosome. Formation of the mitotic figure, centrosomes escaping from the nucleus in G. microsomes at the nodes of the cytoreticulum. By successive aggre- gations of the tertiary and secondary centres arise true centrosomes as new formations. VVatase ('94-9
. The cell in development and inheritance. Cells. B D. ..-f^f^^^H ."^\ F ^ Fig. 148. — Mitosis witli intra-nuclear centrosome, in the spermatocytes o{ Ascaris megalo- cephala, var. univalens. [Brauer.] A. Nucleus containing a quadruple group or tetrad of chromosomes (/), nucleolus {n^, and centrosome (t). Division of the centrosome. Formation of the mitotic figure, centrosomes escaping from the nucleus in G. microsomes at the nodes of the cytoreticulum. By successive aggre- gations of the tertiary and secondary centres arise true centrosomes as new formations. VVatase ('94-95) also finds in the Qg^ of Macro- bdclla, besides the normal aster containing an undoubted centrosome, numerous smaller asters graduating downwards to such "tertiary asters " as Reinke describes with a microsome at the centre of each, and on this basis concludes that the true centrosome differs from a microsome only in degree and may arise de novo. Mottier ('97, 2) finds in pollen-mother-cells numerous minute " cyto-asters" having no direct relation to the spindle-formation (Fig. 133). Again Juel 1 Cf. pp. 52, 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
