30 LETTER OF TRANSMITTAL. 



Geologists who write in other languages than English will have just 

 cause for complaint because of scant reference to publications on meta- 

 morphism in such languages, but the arduous work of preparing this treatise 

 has taxed my eyes to the utmost without goiug exhaustively through 

 foreign literature. 



If this attempt to treat one phase of the phenomena of geology from 

 the point of view of energy proves successful, I shall hope that it will lead 

 to similar treatment of other parts of this great science. 

 Very respectfully, your obedient servant, 



Charles Richard Van Hise. 

 Hon. Charles D. Walcott, 



Director of United States Geological Survey. 



