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N. H. DARTON — CATALOG OF PHOTOGRAPHS 



The collection is now in excellent condition, stored in my office in the 

 building of the U. S. Geological Survey, Washington, D. C, where it is 

 safe from fire, and accessible to a larger number of geologists than it 

 would be in any other locality. During my absence from the city in 

 the summer months the keys to the two boxes containing all of the 

 mounted photographs are deposited with the Chief Clerk of the Survey, 

 who will give members access to the photographs. 



The collection includes a very large amount of fine material, suitable 

 for illustrating geological reports, etc., and for lantern slides. About 

 two-thirds of the negatives are the property of the United States Geo- 

 logical Survey. These negatives have recently been numbered through- 

 out. Their numbers are given in parentheses in this catalog, as well as 

 having been placed on the photographs themselves, which will aid 

 greatly in the ordering of prints or slides. All photographs ordered 

 from Survey negatives should be designated by the name of the photo- 

 grapher and the Survey number and not by the Geological Society of 

 America's number. Applications for prints and lantern slides should be 

 made to the Director of the United States Geological Survey. Prints 

 are obtainable at the following prices : 



Size. 



Unmounted. Mounted. 



11 by 14 inches. . . 

 8 by 10 inches.. . . 

 6J by 82 inches. . . 

 5 by 7 or 8 inches 

 4 by 5 inches 



30 cents 

 20 cents 

 15 cents 

 12 cents 

 8 cents 



35 cents 

 25 cents 

 20 cents 

 15 cents 

 ] cents 



Lantern slides will be made at the uniform rate of 50 cents each. In 

 orders of 100 and over, the slides will be made for 45 cents each. 



The negatives given to the Society by the Second Geological Survey 

 of Pennsylvania have been stored in the photograph gallery of the United 

 States Geological Survey in Washington, and they may be ordered by 

 Mr Harden's numbers as given in this catalog. 



The Committee on Photographs desires to obtain additional material 

 for the collection when it is of a character to clearly illustrate geologic 

 phenomena, structural, stratigraphic, glacial, volcanic, or physiographic. 

 General views of scenery which require explanation as to their geologic 

 significance are not acceptable. 



Alabama 

 Photographed by I. C. Russell 

 8 b}' 10 inches. Negative in United States Geological Survey 

 1. Falls of Black creek, near Gadsden, 100 feet high (No. 59). 



