458 REVIEWS 



is reported as occurring along the Pelly and Dease Rivers (Dawson ' 

 and Hayes ; ^) to the west, between the northern base of the St. Elias 

 Mountains on the Yukon River (Hayes^); along the Upper Tanana 

 River (Allen "^ and Brooks 5), which is correlated by Spurr with the 

 granite along the Pelly River; along Fortymile Creek, a tributary of 

 the Yukon near the Canadian-Alaskan boundary (Spurr*); forming 

 the core of the Kaiyuh Mountains (described by Dall,'' referred to 

 Archean by Spurr^); possibly forming the core of the Alaska Penin- 

 sula and the Aleutian Islands (noted by Dall^ and Purington,'" referred 



to Archean by Spurr"). 



C. K. Leith. 



On Rival Theories of Cosmogony. By the Rev. O. Fisher. Ajneri- 

 ca7i Jonrnal of Science, June 1901, Pp. 414-422. 

 In this article the author has brought the current gaseo-molten 

 hypothesis of the origin of the earth into comparison with the hypoth- 

 esis of gradual accretion without a molten state recently advanced 

 by Chamberlin, and has endeavored to test the tenability of the newer 

 hypothesis by subjecting some of its fundamental postulates to mathe- 

 matical and physical inquiries. The author disclaims holding a brief 

 for either hypothesis and well sustains his claim to an impartial 

 attitude. 



^George M. Dawson : Geological Natural History Survey of Canada, Vol. Ill, 

 Pt. I, 18S7-8, p. 34B. 



= C. WiLLARD Hayes: Geographic Magazine, Vol. IV, 1892, p. 139. 



3 Loc. cit., p. 139. 



'^ Lieutenant H. D. Allen : Expedition to the Copper, Tanana, and Koyukuk 

 Rivers, Senate Documents, Washington, 1897, p. 159. 



SA. H. Brooks: Twentieth Ann. Kept. U. S. Geol. Surv., Pt. VII, 1900, pp. 

 460-465. 



sj. E. Spurr: Eighteenth Ann. Rept. U. S. Geol. Surv., Pt. HI, 1898. pp. 

 134-140. 



7W. H. Dall: Seventeenth Ann. Rept. U. S. Geol. Surv., Pt. I, 1896, pp. 

 862, 863. 



M. E. Spurr: Twentieth Ann. Rept. U. S. Geol. Surv. Pt. VII, 1900, pp. 

 235 and 241. 



9 W. H. Dall: Seventeenth Ann. Rept. U. S. Geol. Surv., Pt. I, 1896, p. 135. 

 ^° C. W. PURINGTON : Manuscript map referred to by Spurr. 



"J. E. Spurr: Twentieth Ann. Rept. U. S. Geol. Surv. Pt. VII, 1900, pp. 

 233-235- 



