1.] MICROSCOPIC PLANTS. 23 



pea. There is besides a very large number of these 

 small moulds which attack various species of plants 

 and fruits. A species of Peronospora (P. effusd) 

 attacks spinach; another (P. gangliformis] is very 

 injurious to lettuces ; P. Schleideniana destroys 

 young onions, and P. trifoliorum attacks the 

 lucerne. 



Exigencies of space compel us to close this chapter, 

 though the number and variety of microscopic plants 

 entitle them to a whole volume ; but perhaps suffi- 

 cient has been said to show the reader that a large 

 amount of recreation and instruction may be obtained 

 by a study of these low forms of plant-life. 



