LIFE HISTORIES OF ALG^ 255 
that is, for the maintenance of the individual; at another 
time the entire plant body functions reproductively, 
that is, for the maintenance of the race to which the 
individual belongs. 
246. Life History of Pleurococcus. The simple life- 
history of Pleurococcus may be briefly indicated as follows: 
OUTLINE OF LIFE HISTORY OF PLEUROCOCCUS 
Unicellular plant 
i 
Cell-divisions 
i 
Temporary cell-aggregates 
4 
Separation of daughter-cells 
?..?' * ** 
Unicellu- Unicellu- Unicellu- Unicellu- 
lar plant lar plant lar plant lar plant 
