ATTRACTION. 491 



According to such hypotheses we must regard the processes of nature not 

 as illustrations of the great principle of the conservation of energy, but as 

 instances in which, by a nice adjustment of powerful agencies not subject to 

 this principle, an apparent conservation of energy is maintained. Hence, we are 

 forced to conclude that the explanation of the cause of gravitation is not to 

 be found in any of these hypotheses. 



622 



