lU 



THE PLANT CELL. 



(a) After the daughter-chromosomes have reached opposite 

 poles of the achromatic spindle, a short period of quiescence 

 supervenes ; then the chromosomes become joined end to end so 

 as to form a typical spireme at each pole (dispireme stage), the 

 band of chromatin being of a single and not a double nature. 

 Each spireme is then broken up into chromatin-granuleB 

 arranged upon a linin thread, and nucleoli once more make their 

 appearance (see Figs. 81, 89). 



Fig. 89. — An End-stage from a 

 Cell of the Young Female 

 Cone of Larix Europcea. The 

 cell-plate is just beginning to 

 form. 





Fig. 30. —Formation of the Cell- 

 plate (complete partition wall 

 between two daughter - cells). 

 The daughter-nuclei are complete 

 (from Hyacinthus root-tip). 



(b) "Whilst these changes have been going on in the daughter- 

 nuclei at each pole of the spindle, small thickenings appear on 

 the fibrils of this structure in the median equatorial plane: 

 these are the first indications of the cell-plate. Gradually these 

 thickenings enlarge, and at last join one another all round, so 



