Stores J&netQv in Mater. 189 



energy competent to gather up the shattered 

 blocks of the largest stone avalanche I have 

 ever seen and pitch them to twice the height 

 from which they fell." 



When we contemplate the foregoing facts as 

 related to so small an amount of water as nine 

 pounds, and multiply this result by the 

 amount of snow- and rain-fall each year and 

 the amount of ice that is congealed and again 

 liquefied by the power of the sun's rays, we are 

 appalled, and shrink from the task of attempt- 

 ing to reduce the amount of energy expended 

 in a single year to measurable units. 



Having considered water in its relation to 

 heat in the preceding chapters, we will now 

 take up the subject of water in its relation to 

 ice and snowfall and the phenomena exhibited 

 in ice rivers, commonly called glaciers. 



When water is under pressure the freezing 

 point is reduced several degrees below 32 

 degrees Fahrenheit. This fact has been de- 

 termined by confining water in a close vessel 

 and putting it under pressure and subject- 

 ing it to a freezing mixture, and by this 

 means determining the freezing point under 

 such conditions. By putting a bullet or 

 something of that nature into the water 

 that is subjected to pressure one can tell 

 by shaking it when the freezing point is 

 reached. If water is put under pressure and 

 cooled to a point below 32 degrees, and yet still 



