No. 470] NOTES AND LITERATURE 



157 



" The Lead, Zinc and Fluospar I K-posits of W(M. ni KCiitn. ky," by 

 E. O. Ulrich and W. S. T. Smitli, lonns Rrujrssiunnl I'aprr no'. 'M\ of 

 the United States Geological Survey. Thv general geology of liie dis- 

 trict is treated by Ulrich, while the detailed (lescription of the ditlereiit 

 deposits is by Smith. Smith regards the (luoiite as having been 

 deposited from circulating underground waters, and having l)een 

 derived, probably, from the limestones of the region. On noticing 

 the number of faults and dikes that have been nia])i)e(l in this region, 

 one questions why a deep-seated >onree of the llnoritc is regarded 



The character of the triclinic feldspars at high tenij>eratiires has 

 recently been investigated by Messrs. Day and Allen. The careful 

 measurements of the melting points, points of crv.stallization, specific 



optical ])ortion of the paper is illustrated by six remarkably clear 

 plates. This report is entitli'd "The Isomorphism and Thermal 

 Properties of the l'cldspar>," and is published by the Carnegie In.sti- 

 tution of Washington, as I' >il,Iiraihm no. 31. 



An exhaustive description of the Bingham District of Utah has 

 been prepared by Boutwell. Keith, and Miinnnn>. Thi- report, 

 which is published as Projessiounl Paprr no. ;!s of the United States 

 Geological Survey, consists of four i)arts. The (list part is a general 

 presentation of the problem by Emmons. The siMond part is l)y 

 Keith, and treats the areal geology of the region. The third, and 

 by far the most important portion of the monograph, is by Houtwell. 

 The successive stages of oxydation are wvW shown by the fact that 

 in the surface zone free gold, some oxides, ami carbonates were found; 

 on descending, a zone of carbonates occurred, with a little sulphide; 

 while, at a greater depth, the sulphides becam(^ more and more abun- 

 dant until the carbonate and oxide ores have given place almost 

 entirely to sulphides, of which the copi)er snlphi.le is most imjiortant, 

 economically. The fourth portion of the report is an app(>n<lix describ- 

 ing the fossils of the Bingham 1 )istrict, by ( liny. 



