Clarence King — Geologist 



while he necessarily did not take into 

 account the great number of new facts 

 which have been established by more 

 recent work, especially in the domain 

 of microscopic petrography, he showed 

 such grasp of his subjects, and such 

 originality and power of thought, that 

 his views constituted not only an im- 

 portant advance over those of the 

 day, but they were suggestive of the 

 lines of investigation that have been 

 most fruitful in the modern advance 

 of geological science. 



For instance, in his discussion of 

 the reason for the changes from acid 

 to basic eruptives within the indi- 

 vidual groups, which he proposed as 

 a variation from the natural order in 

 age of volcanic rocks, as laid down 

 by Richthofen, he advanced views 

 very suggestive of the modern con- 

 ception of differentiation in eruptive 

 magmas. 



Again, in endeavoring to account 

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