THE GREEN PLANT. 37 



* 



make twelve strokes. If you put in a drop of iodine, it 

 will stain the little fellows, and kill them, too; then 



Fig. 27. 



Protococcus-Boats. Protococcus, or Berry-Boat, with 



Oars pulled in. 



you can see how they are made. The pear-shaped cells 

 do not have a tough cellulose sac (Fig. 29) ; these in- 



Fig. 29. 



Pear-shaped Cell without a Sac, or the Boatman without a Boat. 



dependent little sailors seem to jump out of the boats 

 entirely, and go swimming about quite naked in the 

 water. Perhaps they are recruiting their health by 

 sea-bathing. After they have thus bathed to their 

 hearts' content, they retire quietly to the sands, and 

 dress themselves again ; that is, each one builds about 

 himself a new wall, or boat, in which he rests till he 



