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WESTERN SERIES OF READERS. 



springs, and the springs fill the streams, and the 

 streams fill the lakes and the rivers, and in the 

 streams and lakes and rivers live the 

 fresh-water mollusks which we are to 

 study. So you see the mountains really 

 give them their home. 



And some of them live very near the 

 mountain. About a mile beyond Sisson 

 a great spring bursts out from the foot 

 Figure 36. p j a fay fan w hich is itself at the foot of 

 the great mountain. The water from this spring 

 is as cold as ice and as clear as crystal, and there 

 is so much that it quickly forms a beautiful stream 

 several yards wide. 



Great firs and cedars grow along its banks, red 

 lilies and blue monk's-hoods bloom 

 beside its waters, while ferns and 

 sedges bathe their roots below, and 

 grow up green, fresh, and graceful 

 above. 



And in such a beautiful home, 

 right in the very source of the great 

 river, live hundreds of little black 

 water - snails, their smooth shells 

 shaped like Figure 32, though many 

 of them are larger than the picture. 



Figure 37. 



Ill Oregon 



you find another species, with wrinkled shells like 

 the one shown in Figure 33., 



