AND THEIR INHABITANTS. 



237 



serrated leaves. One of the rarest prizes I ever ob- 

 tained amongst water plants was the Bladder Wort, 

 Utricularia vulgaris. This is a floating plant, which 

 derives its buoyancy from numerous bladders of air 

 attached to the leaves, which only suspend it for the 

 purpose of flowering. Ere it ripens seed the bladders 

 fill with water, and the whole plant sinks to the 

 bottom. Among the interesting plants was the Water 



WATER STAR- WORT (Callitriche verna}* 



Star-wort, Callitriche verna. The month of June 

 affords the largest number of flowering plants, as well 

 as the largest number of insects, in my experience. 

 I cannot speak so positively about the microscopic 

 world, for then my attention was so occupied with a 

 variety of large forms, that I did not seem to have 

 time for that close attention which I had given in 



