26 



EEPRODUCTION. 

 Brought about by ordinary cell division : —• 



(1) The nucleus divides into two. 



(2) A cell wall is developed in the plane of the 

 division. Each of these cells can repeat the 

 process. 



(3) The daughter cells round themselves q&. They 

 may remain in union with each other for some 

 time, but finally separate. 



In all probability the Protococcus is only a form 

 of some higher Alga. 



Frotococcus nivalis is ''red snow" — resembles P. 

 pluvialis in all respects except in its colouring 

 matter. 



P. Atlanticus, another species, imparts a red 

 colour to the waters of the Atlantic in some places, 

 and it is probably better to distinguish this as 

 well as P. nivalis as Rcematococci. 



6<^ GY^) (Sr^ e) 6Y^ Ke) 



