376 REVIEWS 
Lower Cambrian. The paper closes with the following conclusions : 
“‘(a) The ‘ Etcheminian’ terrane of Matthew is of Lower Cam- 
brian age. 
““(6) The Olenellus fauna is older than the Paradoxides and Pro- 
telenus fauna of the Middle Cambrian. 
““(c) The Cambrian section of the Atlantic Province of North 
America includes the Lower, Middle, and Upper Cambrian divisions as 
defined by me in 1891.” 
R. D. GrorceE. 
Forest Reserves. Part V of the Nineteenth Annual Report of the 
United States Geological Survey. HEnry Gannett, Chief of 
Division, Washington, D. C., 1899. 
This report consists of the following parts: The forests of the 
United States, by Henry Gannett; Black Hills Forest Reserve, by H. 
S. Graves ; Big Horn Forest Reserve, by F. E. Town; Teton Forest 
Reserve, from notes by F. S. Brandegee; Yellowstone Park Forest 
Reserve, from notes by F. S. Brandegee; Priest River Forest Reserve, 
by J. B. Leiberg ; Bitterroot Forest Reserve, by J. B. Leiberg; Wash- 
ington Forest Reserve, by H. B. Ayers; Eastern Part of Washington 
Forest Reserve, by M. W. Gorman; San Jacinto Forest Reserve, by 
J. B. Leiberg ; San Bernardino Forest Reserve, by J. B. Leiberg ; San 
Gabriel Forest Reserve, by J. B. Leiberg: Forest conditions of 
Northern Idaho, by J. B. Leiberg; Pine Ridge Timber, Nebraska, 
by N. H. Darton. 
According to the report there are in the United States, exclusive of 
Alaska, 1,094,496 sq. miles of wooded land, or in other words 37 per. 
cent of the total area is wooded. The total value of the forest product 
of the country for 1890 was 800 million dollars which is an amount 
slightly in excess of its mineral production. The total amount of 
sawed lumber consumed was 23,500 million feet B. M., and the amount 
used for fuel was 180,000 million feet B. M. 
The sources of injury to forests are classed under the categories 
of fires, winds, lightning, insects, and wasteful methods of lumber- 
ing. The necessity for better forest management is urged in order 
to prevent waste, and to establish forests in the place of those being 
depleted for legitimate purposes. It is urged that the object of forest 
management should be to produce forest products in as short a time 
