ASEXUAL REPRODUCTION 



323 



ductive cells, has the same number and kind of chromo- 

 somes. It naturally results from this that the successive 

 generations are very similar indeed, no variations ordinar- 

 ily occur excepting such as are due to the different envi- 

 ronments under which the successive generations may 



Fig. 81. — (Edogonium. 1, 2, 3, 4, showing the way in which the 

 contents of a cell transform themselves into a swimming spore and 

 escape from the old cefll. 5, 6, show swimming spores formed from 

 the fertilized egg shown in fig. 83. 7, 8, 9, show the germination of 

 swimming spores to form new filaments. 



grow. The advantage of this type lies in the extraor- 

 dinary rapidity of multiplication enabling the plant 

 to occupy all available space. It does not of itself give 

 rise to any variation. 



