AMERICA. Ill 



are noticed, and also the economical bearings of the subject ; and a long 



discussion follows. W. W. 



Aramato, Avelino. BoUvia. Extracts from a work published in 



London in 1863, pp. viii, 104. 8vo. London. 

 I. Present State of Mining, pp. 1-8. II. Means that should be em- 

 ployed for the Advancement of Mining Industry, pp. 8-20. Topogra- 

 phical Report of the engineer, Hugo Reck, pp. 60-68. 



Slight reference to geological subjects. W. W. 



Avi;-LALLEMANT, H. E. Erfahrungcu im Goldbergbau in der Argen- 

 tinischen Republik." [Gold-minmg in the Argentine Republic] 

 La Plata-Monatschrift, August, pp. 192-194; September, pp. 205, 

 206 (1873) ; and January, pp. 6, 7 (1874). 

 Contains some geological and mining details with reference to gold- 

 mining in the district. 



Belt, Tkomas. The Naturalist in Nicaragua, pp. xvi, 403 (4 geo- 

 logical and mining sections). 8vo. Lond. 

 The author believes that metalliferous veins have been formed by 

 igneous injection, but admits that many have had their materials re- 

 arranged by hydrothermal and other agencies, and gives details as to the 

 mode of occurrence of the gold-bearing quartz reefs of Central America. 

 He saw Boulder Clay up to heights of 3000 feet ; and, according to him, 

 the results of glacial action are very marked and wide- spread in the 

 American tropics. He believes in the presence of an ice-cap during the 

 Glacial period, and suggests that many tropical species that lived before 

 and after that time migrated to the lands left vacant by the lowering 

 of the sea through the arrest of large volumes of water in frozen masses 

 over the land, and suggests the possibility of the existence, during the 

 glacial period, of the fabled Atlantis, and of a large Malayan and Poly- 

 nesian continent. The origin of lake Nicaragua is discussed, as well as 

 the general physical geography of the surrounding regions. C. E. DeR. 

 Blake, James. Trachytic and doleritic rocks in alternations in the 

 Puebla range of mountains, in the northern part of Humboldt 

 County, Nevada. Amer. Journ. sor. 3, vol. vii. pp. 235, 236. 

 Short abstract of paper in Proc. Calif. Ac. Sci. vol. v. p. 210 (1874?). 

 Blandy, John F. Topography, with especial reference to the Lake- 

 Superior Copper District. Trans. Amer. Inst. Min. Eng. vol. i. 

 pp. 75-82. 

 Shows the connexion of surface-features with geological structure, 

 and their importance to the mining engineer. 



Brady, Sir Antonio. Report on Splint Coal Property : the proposed 

 site of Kanawha city, West Virginia, U. S. A. 8vo. Lond. Pp. 1- 

 16, woodcuts. [Privately printed.] 

 A section of the Coal Measures on the banks of Great Kanawha river 

 is given, with the thickness of each coal-seam. 



Broadhead, Garland C. Report of the Geological Survey of the 

 State of Missouri, including Field-work of 1873-74, with 91 illua- 



