Elevations in Ohio and the adjacent States. 17 
Summit of Wabash and Erie Canal, near Fort —— + ial, 
Indiana, - 810 feet. 
Summit of Chicago Creek ons Illinois Rives; - 595 -* 
Portage, Fox and Wiskonsan Rivers, Fort Winnebago, 699 ‘“ 
Elevations in etd te 
Conneaut Lake, - - 1074 feet. 
Alleghany summit, Bale route of. ‘Schlatter? $ sur- 
veys, - 2002 * 
Sugar Run summit, two shits eceeh of of Portage Rail- 
road summit, 2183.“ 
Chestnut Ridge, National Road, 6 eee hs 
Keyser’s  * - - - 2843. 
West: Alexandria, < <0 sree et os ATT 
Wesshington ge oe Bg hes ee x AAV BSE 
Elevations in New York. 
Chatauque Lake, - - - 1291 feet. 
Franklinville, Chatauque thy (ita a yalisy,) i588“ 
Summit between Elm Creek and Little binge Creek, 7 
Cattaraugus County, 1725 * 
Summit between Big and Little Valley Gixcics << 2A 
. " Cayuga Lake and Susquehanna River, 981 “ 
— “ - Seneca Lake and Chemung River, 890 “— 
‘s «the sources of the Alleghany and a 
waters of Lake Erie, at the lowest pass, - 
The ledge of Niagara limestone causing the caine 
of Niagara, Genesee, Oswego and Black Rivers, 551 
Height of land between Buffalo and Lewiston, 640 “ 
is “between Buffalo and 8 - 590 “ 
Mohawk, at Little —o oT eee - 385“ 
Hills iihavent, Pee ae 
Round Top, Catskill Msiittns! pe Le + Oe 
Summit on Welland Canal, a = eS 6242 “ 
This collection of altitudes is now published with a desire to 
bring out similar statements from other quarters. ‘Topographical 
geology is of the highest value in reducing the science from a 
state of general calculation to the exactness of mathematical rules. 
But such results require great labor, and make little show on pa- 
per. If the engineers and geologists ve the United States would 
Vol. xiv, No, 1,—April-June, 1843, 
