Fig. 17. — Aquatic Vegetation-, nearly Stagn'ant Waters, Floating-leaf 

 Association with Pota}>iogeioii natans. 



Messrs. Flatto s and Garnctt (Copyright). See page 83. 



Fk;. 18. — Aqu.\tic Vegetation, slowly-flowing Waters, Reed-sw.^mp Association 



WITH Fhragjiiites coiiimiatis. 

 C. F. Mapp. Seepage 83. 



