Fig. 8. — Marginal rim. The sedge zone here is very narrow, the dwarf birches and 

 willows, not as tall as a man, coming close to the water's edge. The picture was taken in 

 Tune before the leaves had come out on the shrubs. Photograph by Mr. G. S. Dodds. 



FlG. 9. — Sedge zone along the south shore. The invasion of the lake by sedges is 

 shown. Photograph by Mr. G. S. Dodds. 



Redrock Lake near Ward, Colorado 

 (II) 



