The cell in development and inheritance . D Fig. 42. — Mitosis in Noctihica. [Calkins.]A. Prophase; division of the sphere to form the central spindle; chromosomes converging tothe nuclear pole. B. Late anaphase, in horizontal section, showing centrosomes; the centralspindle has sunk into the nucleus; nuclear membrane still intact except at the poles. C. Earlyanaphase; mantle-fibres connected with the diverging chromosomes. D. Final anaphase (whichis also the initial prophase of the succeeding division of spore-forming mitosis) ; doubling of cen-trosome and splitting of chromosomes. rise by a
The cell in development and inheritance . D Fig. 42. — Mitosis in Noctihica. [Calkins.]A. Prophase; division of the sphere to form the central spindle; chromosomes converging tothe nuclear pole. B. Late anaphase, in horizontal section, showing centrosomes; the centralspindle has sunk into the nucleus; nuclear membrane still intact except at the poles. C. Earlyanaphase; mantle-fibres connected with the diverging chromosomes. D. Final anaphase (whichis also the initial prophase of the succeeding division of spore-forming mitosis) ; doubling of cen-trosome and splitting of chromosomes. rise by a division to a fibrillated central spindle, about which thenucleus wraps itself while mantle-fibres are developed from thesphere-substance and become attached to the chromosomes, the nu-clear membrane fading away along the surface of contact with thecentral spindle (Calkins). Broadly speaking, the facts are similar in 94 CELL-DIVISION the diatoms {Surirella, t. Lauterborn), where the central spindle,arising by a peculiar process from an
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1902
