86o 



STUDIES FOR STUDENTS 



by selecting as a standard of comparison that of the constituents 

 which has suffered the least through the leaching action of 

 water during the process of degeneration, we may gain by cal- 

 culations which it is unnecessary to repeat here a series of 

 numbers showing the loss of constituents as given below, and 

 which may safely be accepted as rather under than above the 

 actual figures. 



ANALYSES OF FRESH AND DECOMPOSED GNEISS. 



ANALYSES OF FRESH ELiEOLITE SYENITE AND RESIDUAL KAOLIN. 



