Geology and Natural History. 147 
7. Final Report of the United States Geological Survey of 
Nebraska, and portions of the Adjacent Territories, made under 
187 pp. 8vo, with several lithographic plates of fossils and 
a geologic —This very valuable Report was communicate 
Commission of the General Land Office, b yden 
account of the geological formations along the route of the Union 
Pacific Railway, Eastern Division, Dr. Hayden observes in his 
introductory remarks, that the State of Nebraska, while over 
three hundred and sixty miles in average length from north to 
south, and one hundred and seventy in average width, presents to 
view the rocks of only three geclogical formations—the Upper 
Carboniferous, the Cretaceous and the Tertiary. The Carbonife- 
rous beds thin out in their western extension and almost disappear 
in the region of the Rocky Mountains. The thickest coal beds * 
are 12 to 30 inches thic 
descriptions and figures of fossils are given with Mr. Meek’s usual 
Scudder on the Orthoptera collected in Nebras 
8. Miers, Contributions to ciety © Teonographie and Descrip- 
of South American Plants, we have the present collection of three 
volumes, the text of which is a reprint of papers contributed, at 
illustrations now added consisting of 154 quarto plates, litho- 
graphed from Mr. Miers’ own excellent drawings. Still another 
