64 Scientific Intelligence. 
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its results. The geology of the several districts are separately 
illustrated by colored geological maps; and the style of the vol- 
ume is well adapted to give intelligible ideas of the geology and 
O 
oal-Regions of America: their Topography, Ge- 
the best of American geologists, who has labored much among the 
rocks of the State, and especially its coal strata.’ This and the 
other maps and illustrations are excellent. 
8. Geological Map of the. United States, compiled for the 9th 
ye 1 W.P. Brace. (J. Bien, New 
York, lithog.)—The need of a geological map of the United 
States has been long and urgently felt by all students of the 
science. The admirable chart of Canada, which, through the lib- 
(34 22 in), with no geological details beyond an indication in 
colors of the grander areas—namely, the Eozoic, with which 
the metamorphic areas are united under one color; the Silurian— 
e Devonian and Subecarboniferous—the Carboniferous and Per — 
mian—the Triassic and Jurassic—the Tertiary—the Alluviam— 
* Third Series, i, 216. 
_ + Its size is 8 feet by 34, and it is sold by Dawson Brothers, Montreal, for $18 
in sheets, and $24 on cloth in portfolio. 
