Qttounfain Bc&tB 



long climatic periods made up of the short 

 winters and the other changing seasons such as 

 we know. The glacier lake is slowly created, but 

 an avalanche may blot it out the day after it is 

 completed. Other lakes more favorably situ- 

 ated may live on for thousands of years. But 

 every one must eventually pass away. These 

 lakes come into existence, have a period of 

 youth, maturity, and declining years; then they 

 are gone forever. They are covered over with 

 verdure — covered with beauty — and forgotten. 



