_ GROWTH AND ORIGIN OF MULTICELLULAR PLANTS. 265 
Ce) 
elongates and forms a new cell, a transverse septum appearing at 
the basal end, cutting it off from the cell below, from which it was 
derived. The cell-wall, when first exposed by rupture of the 
f 
ring, which is situated a little below the position occupied by the 
first one, and ually a second cell is formed after the manner 
rogres whe in (Hdogonium, on 
may be areued that with the exception of the apical-cell, increase 
a! eat s is due to interstitial cell-division ; but although inter- 
ially pla the mode of segmentation from the same cell 
several times in succession resembles in every respect what 
place at the growing-point m other cases, and 
difiers widely from 
