Samuel Franklin Emmons 



therefrom. This he wrote in the 

 winter of 1877-78, and published in 

 a quarto volume of more than eight 

 hundred pages under the title of 

 Systematic Geology. It has been 

 characterized as the most masterly 

 summary of a great piece of geologi- 

 cal field-work that has ever been 

 written, and is used to this day by 

 university professors of geology as a 

 model for their advanced students. 



King's crowning service to geo- 

 logical science in America followed 

 shortly after the completion of the 

 Fortieth Parallel work. After two 

 of his field seasons had demonstrated 

 the practicability of geological map- 

 making in the West, the Wheeler 

 Survey was inaugurated under the 

 Engineer Department of the Army, 

 and the already existing Hayden 

 Survey later adopted his example in 

 making topographical maps as a basis 

 for its geology, employing for this 

 271 



