[3] 



70 



ALOffl 



Pleurococcus. 



A. Remove a small quantity of the green powder from the piece of bark provided, and mount in a drop 

 of water. Examine under a high power and sketch a single Pleurococcus cell, shewing the cell-wall and the chloro- 

 plast which occupies most of the cell cavity, often appearing completely to fill it. Look for cells in which colourless 

 protoplasm can be seen at one side of the cell. The nucleus can rarely be distinguished. 



B. Mount some of the Pleurococcus from the watch-glass of water and draw groups of cells illustrating 

 different stages of division. 



