Geology. 



453 



It interested me to see how far this lai'ger collection of anal- 

 yses compiled by a competent hand would warrant my reference. 

 This took a little study, since the index to the paper does not 

 group the analyses under any one head. It has seemed to me, 



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therefore, that my compilation of the analyses in order of con- 

 centration might be worth record. 



The geological column of Missouri shows a distinct transition 

 from that typical of the east to that of the west, the Grand Canyon 



