74 oy BOTANICAL GAZETTE [ AUGUST 
have, therefore, no connection with the spindle fibers. After 
reaching the equator the granules fuse into a continuous layer 
across the central spindle. The growth of the cell plate occurs © 
by the addition of new material either all around, if the spindle 
is in the middle part of the cell, or on the free sides, if the 
spindle is near one side of the cell so that the cell plate has 
reached the mother cell wall on that side where it is first formed, 
7. e., the whole nuclear figure moves across the cell, building the 
cell plate as it goes. By plasmolyzing the cell by the addition 
of more KNO, Treub was able to demonstrate that the new cell | 
| 
these new fibers (of. cit., 
Anthoceros and the m 
