postelsia 63 



Sparganiums, grasses and rushes are commonly 

 found along these. 



In many places, strips of meadow land are 

 found on either side of the stream, the com- 

 position of which merits no special elucidation. 



b Rivers and Streamlets — The two rivers 

 which enter into consideration, the Gordon and 

 the San Juan, are streams of considerable vol- 

 ume. The former is swift, falling 50 meters in the 

 last 12 kilometers. Its waters are of unusual 

 clearness and of low temperature. These factors 

 are responsible for the fact that no higher plant 

 life is developed in it, at least not throughout 

 the extent explored. 



The San Juan on the other hand especially 

 in its lower reaches is a much slower flowing 

 stream. Along it are found occasional sloughs 

 and in these various aquatics like Fojitiiialis, 

 Sparganhim, Nymphcca and Callitriche are de- 

 veloped. 



There are a large number of streams in the 

 region, most of which are small brooks that find 

 a rapid descent through the numerous gullies 

 of the forest into the adjoining sea. Under 



