514 Reproduction in Fresh- Water Alyce. (September, 
dividual forms four plants, each of which in turn gives rise to four 
more, so that often, under the. microscope, these divisions can be 
traced through several generations on account of the difference 
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(Fre. 85.) DIVISION OF CELLS IN ALG. 
in size of the individuals and the relations which they bear to 
each other in space. (Figure 85, b, e, and d.) This simple asex- 
ual reproduction is the only method known in these lowest forms 
of plants. 
(F10. 86.) MULTIPLICATION OF DESMIDS BY DIVISION. 
The Desmids form a large group of unicellular fresh- see 
plants, which have attracted much attention and study cts 
the variety and beauty of the forms and markings which they 
