PLaTeE X.—A FRESH-WATER POOL. 
Showing on the surface Water-Lilies, Duckweed, some insects (Water- 
Measurers) gliding on the surface, a Water-Snail gliding back down- 
wards below the surface-film. Below may be seen a Crested Newt, 
two Water-beetles (Dytiscus), a Water-Spider and her dome-like 
Web; also a Sponge growing on the bulrush. 
