1900 | THE CELL PLATE. IN HIGHER PLANTS 99 
orange, and strongly orange stained granules are often apparently 
imbedded in the adjacent thick plasma membranes. The above 
facts seem to indicate that there may be in the protoplasm some 
form of reserve carbohydrate in readiness for the formation of a 
cell wall. I shall hereafter use the term carbohydrate material 
in speaking of the interfilar substance. The further history of 
this material is connected with the subsequent stages in the 
development of the cell plate. The essential difference thus far 
between the larch and the onion is that in the former the pro- 
cesses preparatory for cell division have been mainly carried on 
in the already existing fibers, while in the latter there has been a 
formation of new fibers and an aggregation of carbohydrate 
material in the equatorial region of the central spindle. 
UNIVERSITY OF WISCONSIN. 
(Zo be concluded.) 
