J 
American Geology, by T. S. Hunt. 409 
ls on its opp lopes. Its form 
appears to result from three anticlinals, the middle of which has 
ward, bringing his great knowledge of the sedimentary forma- 
tions of North America to bear upon the theory of continents 
and mountains. These were first advanced in his a 
livered before the American Association for the Advancement 
of Science, as its president, at Montreal in August, 1857. This 
address was never published, but the author’s views were 
and central parts of North America is directly connected with 
ter accumulation of sediment along the Appalachians. 
He has further shown that so far from local elevation being con- 
cerned in the formation of these mountains, the strata which 
