390 Scientific Intelligence. 



of the Erie and Ohio basins ; by Fkank Leverett. (Held for 

 review.) 



Bulletins. No. 179. — Bibliography and Catalogue of the Fos- 

 sil Vertebrata of North America ; by Oliver Perry Hay. Pp. 

 1-868.' Washington, 1902.— The author has rendered an immense 

 service to his fellow paleontologists in completing this list of 

 all the fossil vertebrates described, up to the end of 1900, from 

 all that part of the North American continent lying north of 

 Mexico. The list of systematic names recorded reaches nearly 

 10,000 ; and the number of titles referred to in the bibliography 

 is about 4600. The author estimates that there are over 40,000 

 citations recorded. The method of arrangement of the statistics 

 and the mode of citations have greatly condensed the mass of 

 material. The specific names are arranged according to their syste- 

 matic order in the catalogue. A separate key is given of this 

 catalogue, and under each scientific name in the catalogue are 

 given all the citations recorded, but abbreviated to author's name, 

 date, and a letter (A, B, C, etc.) standing for the separate papers 

 of each author published during one year. In the Bibliography 

 these letters mark the several papers whose titles are given in 

 full. By this means the size of the volume is greatly reduced 

 without omitting the important details called for by the user. A 

 complete index of all the sj^stematic names cited occupies the 

 last 72 pages. The author deserves the gratitude of all paleon- 

 tologists who may use this model catalogue of fossil vertebrates. 



H. s. w. 



No, 182. — A report on the Economic Geology of the Silverton 

 Quadrangle, Colorado; by F. L. Ransome. 258 pp., 16 pis., 23 

 figs. This is a complete and detailed report on the economic 

 geology, of the ore deposits and mining operations of a quad- 

 rangle situated in the midst of the San Juan Mountains in south- 

 western Colorado, The first part of the report consists of a 

 general description and discussion of the ore deposits and includes 

 a chapter on the general geology of the region by Whitman 

 Cross, while the second part consists of detailed description of 

 special areas and individual mines. The area is covered with a 

 complex of volcanic rocks consisting of a thick series of tuffs, 

 agglomerates and lava flows. The ores occur in these rocks ; 

 either as lodes or as nearly vertical stocks of almost solid ore. 

 The chief ore minerals carrying silver are galena, tetrahedrite, 

 enargite, stromeyerite, bornite and chalcopyrite. Gold is present 

 in the ore as native gold almost entirely, no important occur- 

 rences of tellurides being known. The ores were deposited from 

 acid solutions for the most part in preexisting openings and some 

 of the deposits show the effects of descending surface waters in 

 the secondary enrichment of their upper portions. w. e. p. 



No. 188. — Bibliography of North American Geology, Paleon- 

 tology, Petrology and Mineralogy for 1892-1900 inclusive ; by 

 F. B. VYeeks, 717 pp. This bulletin is a combination of bulletins 

 Nos. 130, 135, 146, 149, 156, 162, 172 with the bibliography of 



