The cell in development and inheritance . res for division,the most conspicuous fact is a transformation of the nuclear substance,involving both physical and chemical changes. The chromatin-sub-stance rapidly increases in staining-power, loses its net-like arrange-ment, and finally gives rise to a definite number of separate intenselystaining bodies, usually rod-shaped, known as cJiromosonies. As a rulethis process, exemplified by the dividing cells of the salamander-epi-dermis (Fig. i) or those of plant-meristem (Fig. 2), takes place as fol-lows. The chromatin resolves itself little by little
The cell in development and inheritance . res for division,the most conspicuous fact is a transformation of the nuclear substance,involving both physical and chemical changes. The chromatin-sub-stance rapidly increases in staining-power, loses its net-like arrange-ment, and finally gives rise to a definite number of separate intenselystaining bodies, usually rod-shaped, known as cJiromosonies. As a rulethis process, exemplified by the dividing cells of the salamander-epi-dermis (Fig. i) or those of plant-meristem (Fig. 2), takes place as fol-lows. The chromatin resolves itself little by little into a more or lessconvoluted thread, known as the skeiti (Knauel) or spireme, and its sub-stance stains far more intensely than that of the reticulum (Fig. 25).The spireme-thread is at first fine and closely convoluted, forming theclose spireme. Later the thread thickens and shortens and the 66 CELL-DIVISION convolution becomes more open (open spireme). In some casesthere is but a single continuous thread; in others, the thread is from.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1902
