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1894.] Recent Literature. 945 
Economic Geology of the United States.—In a volume of 
509 pages, Mr. R. S. Tarr has compiled the information, up to 1893, 
concerning the mineral resources and industries of the United States. 
Although intended as a text-book to supplement a course of lectures 
at Cornell University, the style of the writer makes it of general inter- 
est. Part I treats of the common rock and vein-forming minerals and 
ores, the rocks of the earth's crust, physical geography and geology of 
the United States, origin of ore deposits, and mining terms and meth- 
ods. Part II takes up metalliferous deposits in detail. The statistics 
are almost all compiled from the standard sources. An appendix con- 
tains the literature of the subject and a list of authors and works re- 
ferred to in the text. A number of cuts illustrate the text. 
Woods’ Invertebrate Paleontology.'—This crown octavo of 
222 pages, by Professor Henry Woods, is the first of the Cambridge 
Natural Science Manuals. In it the author presents a condensed ac- 
count of the invertebrate paleontology necessary for a geological stu- 
dent, limiting himself for space reasons to a consideration of those 
fossil animals that are most useful to a stratigraphist. Each group is 
discussed according to the following general plan: first, its general 
geological features; secondly, the classification, characters and time 
range of the geologically important genera; thirdly, the distribution 
of each group. The text is abundantly illustrated and well indexed. 
3 Economie Geology of the United States with briefer mention of Foreign Min- 
eral Products. By R. S. Tarr. New York, 1894. MacMillan & Co., Pub- 
lishers 
+ Riementary Paleontology for Geological Students. By Henry Woods, B. A., 
F.G.S. Cambridge, 1893. 
