GROWTH 



205 



cautiously rolling them to and fro under the micro- 

 scope, we see that the outgrowths just mentioned retain 

 the same appearance whatever be the position of the 

 cell. This means that they are not simply a pair of 

 horns, as might have been supposed at first sight, but 

 a whole ring encircling the inside of the cell. If we 



D 



FIG. 58. 



go on observing the same cell we shall notice that this 

 girdle will grow deeper and deeper into the cell, dividing 

 its contents in half. About this time two nuclei are 

 observed instead of the single central one. In the end 

 the girdle joins up completely in the middle, forming a 

 continuous partition across the cell. Two cells are 

 thus formed out of the one, each with its own nucleus 

 protoplasm and chlorophyll band, and separated by a 



