262 



MICROSCOPIC FORMS OF VEGETABLE LIFE. 



new sphere. The growing Yolvox at first increases in size, not 

 only by the interposition of new hyaline substance between its 

 component masses of endochrome, but also by an increase in 

 these masses themselves (B, a), which come into continuous con- 

 nection with each other by the coalescence of processes (b) which 



FIG. 70. 



Various Stages in the Development of Volvox Globator. 



they severally put forth ; at the same time, an increase is ob- 

 served in the size of the globular cell (c), which is preliminary 

 to its binary subdivision. A more advanced stage of the same 

 developmental process is seen at c ; in which the connecting pro- 

 cesses (a a) are so much increased in size, as to establish a most 

 intimate union between the masses of endochrome, although the 

 increase of the intervening hyaline substance carries these masses 

 apart from one another; whilst the endochrome of the central 



