18 



The massed chromosomes quickly begin to show 

 vacuoHsation (Fig. 26), and their chromatin thus broken up 

 into irregular portions is arranged along the linin reticulum, 

 a nuclear membrane is formed and the resting stage of the 

 daughter nucleus is reached. One or more nucleoli which 

 appeared during the anaphases enter each new nucleus. In 

 some instances nucleoli may remain outside the nucleus in 

 the cytoplasm (Figs. 17 and 19), where they soon disappear 

 altogether. 



MITOSIS IN VEGETATIVE CELLS. 



The resting nucleus, as already described, contains one 

 or more nucleoli and the characteristic reticulum, which 

 gradually passes into a thickened convoluted spirem. This 

 splits longitudinally and into elongated, more or less bent 

 chromosomes with spindle fibrils attached to the ends, 

 which point towards the respective poles of the cell where 

 they converge in a cap of kinoplasm, and from which they 

 were probably derived. In Sarracenia^^ the spindle 

 filaments probably come from the nuclear linin, no break 

 in the membrane taking place until they have begun to 

 appear (Fig. 27). 



The chromosomes lying side by side in the nuclear- 

 plate are, in the anaphase, drawn by spindle fibrils end-on 

 towards the poles, their free bent ends pointing towards the 

 equator, or to the sides of the cell (Fig. 28j. They 

 shorten, thicken and unite more or less compactly into the 

 daughter spirem. After vacuoHsation has taken place and 

 the chromatin has been distributed, the linin thread takes 

 on the net-like appearance and constitutes the reticulum 

 of the daughter nucleus. Spindle threads stretching 

 across the equator of the cell connect the two groups of 

 chromosomes. 



