ii ADVERTISEMENT. 



Pablished. 



IV. Comstock Mining and Miners, by Eliot Lord. In press. 



V. Copper-bearing Rocks of Lake Superior, by Professor R. D. Irving. lu press. 



VI. Older Mesozoic Flora of Virginia, by Prof. William M. Fontaine. In press. 

 Geology and Mining Industry of Leadville, with atlas, by S. F. Emmons. In preparation. 

 Geology of the Eureka Mining District, Nevada, with atlos, by Arnold Hague. In preparation. 

 Coal of the United States, by Prof. R. Pumpelly. In preparation. 



Iron of the United States, by Prof. R. Pumpelly. In preparation. 



Lesser Metals and General Mining Resources, by Prof. R. Pumpelly. In preparation. 



Lake Bonneville, by G. K. Gilbert. In prej)aration. 



Dinocerata. A monograph on an extinct order of Ungulates, by Prof. O. C. Marsh. In press. 



Sauropoda, by Prof. O. C. Marsh. In preparation. 



Stegosauria, by Prof O. C. Marsh. In preparation. 



Of these monographs, numbers II. and III. are now published, viz : 



II. Tertiary History of the Grand Canon District, with atlas, by C. E. Duttou. 1882, 4°, 264 

 pp., 42 plates, and atlas of 26 double sheets folio. Price $10.12. 



III. Geology of the Comstock Lode and Washoe District, with atlas, by George F. Becker. 18S2, 

 4°, 422 pp., 7 plates, and atlas of 21 sheets folio. Price |11. 



Numbers IV., V., and VI. are in press and will appear in quick succession. The others, to which 

 numbers are not assigned, are in preparation. 



BULLETINS. 



The Bulletins of the Survey will contain such papers relating to the general purpose of its work 

 as do not come properly under the heads of Annual Reports, or Monographs. 



Each of these Bulletins will contain but one paper and be complete in itself. They will, how- 

 ever, be numbered in a continuous series, and will in time be united into volumes of convenient size. 

 To facilitate this each Bulletin will have two paginations, one proper to itself and another which 

 belongs to it as part of the volume. 



Of this series of Bulletins No. 1 is already published, viz : 



1. On Hyperstheue-Andesite and on Triclinic Pyroxene in Augitic Rocks, by Whitman Cross, 

 with a Geological Sketch of Buffalo Peaks, Colorado, "by S. F. Emmons. 1883. 40 pp., 8°. Price 10 

 cents. 



Correspondence relating to the publications of the Survey, and all remittances, should be addressed 

 to the 



Director of the United States Geological Sukvey, 



Washington, D. V. 

 Washington, D. C, March 1, 1883. 



