LETTER OF TRANSMITTAL. 



Depx\rtment of the Interior, 



United States Geological, Survey, 



Washington^ D. 6'., July 16^ 190^. 



Sir: I have the honor to transmit herewith the manuscript of 

 a paper entitled " Fhiorspar Deposits of Southern Illinois," by 

 H. Foster Bain, and to recommend that it be published as a bulletin. 

 This paper embodies the results obtained in a detailed study of the 

 fluorspar deposits of this important district, the study having been 

 undertaken in connection with the investigation of the lead and zinc 

 deposits of the Mississippi Valley region. The area covered is at 

 present the most important producer of fluorspar in the United 

 States. 



Very respectfully, C. W. Hayes, 



Geologist in Charge of Geology. 

 Hon. Charles D. Walcott, 



Director United States Geological Survey. 



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