The cell in development and inheritance . spindle-hbres, to be largely composed. In support of this may bementioned, besides the mode of formation of the partition-walls in the division of plant-cells, Harpers (97) very interesting observations on the formation of the ascospores inErysiphe (Fig. 33), where the spore-membrane appears to arise directly from the astralrays. 56 GENERAL SKETCH OF THE CELL focussed at the centrosome. On this basis he endeavours to explainthe position and movements of the nucleus, the succession of division-planes, and many related phenomena.^ Hatschek (88) and Rabl
The cell in development and inheritance . spindle-hbres, to be largely composed. In support of this may bementioned, besides the mode of formation of the partition-walls in the division of plant-cells, Harpers (97) very interesting observations on the formation of the ascospores inErysiphe (Fig. 33), where the spore-membrane appears to arise directly from the astralrays. 56 GENERAL SKETCH OF THE CELL focussed at the centrosome. On this basis he endeavours to explainthe position and movements of the nucleus, the succession of division-planes, and many related phenomena.^ Hatschek (88) and Rabl (89, 92), on the other hand, have ad-vanced a quite different hypothesis based on physiological considera-tions. By cell-polarity these authors mean, not a predeterminedmorphological arrangement of parts in the cell, but a polar differen-tiation of the cell-substance arising secondarily through adaptation ofthe cell to its environment in the tissues,and having no- necessaryrelation to the polarity of Van Beneden (Fig. 22, B, C). This is.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1902
