AND ITS SELF-CCWSERVATION. 79 



strain incident to the condensation of nebulous masses 

 into stars and suns and their attendant spheres. 



It is a notable fact, too, that even by artificial means a 

 gas may be subjected to so great a pressure as to cause it to 

 give off a continuous spectrum. It is as if, out of a single 

 element, the increased complexity of grouping of centers 

 of force together with the intensified strain between those 

 centers corresponding to increase in the number of ele- 

 ments by the analogous process exhibited on the grand 

 scale in nature could thus temporarily be reproduced at 

 will in the laboratory. 



