DOMAIN XI 



DECOMPOSED. 



THE decomposition of rocks forms a importance of 

 striking feature in geology, as a great part 

 of the productive soil, and many of the 

 substances used in important manufac- 

 tories, may be considered as chiefly derived 

 from this circumstance. Several of the 

 most useful clays are reputed by some to 

 be merely decompositions of felspar; the 



VOL. II. 



