The cell in development and inheritance . %: Fig. 148. — Mitosis with intra-nuclear centrosome, in the spermatocytes of Ascaris megalo-cephala, var. univalens. [Brauer.] A. Nucleus containing a quadruple group or tetrad of chromosomes (/), nucleolus («), andcentrosome ((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 centrosomesas new formations. Watase (94-95) also finds in the &%% of JMacro-bdella,
The cell in development and inheritance . %: Fig. 148. — Mitosis with intra-nuclear centrosome, in the spermatocytes of Ascaris megalo-cephala, var. univalens. [Brauer.] A. Nucleus containing a quadruple group or tetrad of chromosomes (/), nucleolus («), andcentrosome ((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 centrosomesas new formations. Watase (94-95) also finds in the &%% of JMacro-bdella, besides the normal aster containing an undoubted centrosome,numerous smaller asters graduating downwards to such tertiaryasters as Reinke describes with a microsome at the centre of each,and on this basis concludes that the true centrosome differs from amicrosome only in degree and may arise dc novo. Mottier (97, 2)finds in pollen-mother-cells numerous minute cyto-asters havingno direct relation to the spindle-formation (Fig. 133
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1902
