Elevations in Ohio and the adjacent States. 17 
Summit of Wabash and Erie Canal, near Fort Wayne, 
Indiana, - - - - - - - 810 feet. 
Summit of Chicago Creek and Illinois River, - 595 
Portage, Fox and Wiskonsan Rivers, Fort Winnebago, 699 ‘“ 
Elevations in Pennsylvania. 
Conneaut Lake, - - - - - - 1074 feet. 
Alleghany summit, northern route of Schlatter’s sur- 
veys, - - - - - - - 2002 % 
Sugar Run summit, two miles north of Portage Rail- 
road summit, - - - - - 2183 “ 
Chestnut Ridge, National Road. - - - 3612 
Keyser’s  “ OO 1 - - - 2843 * 
West Alexandria, - ° - - - - - WOU 
Washington, - - - - - - - 1400 “« 
Elevations in New York. 
Chatauque Lake, - - - - - - 1291 feet. 
Franklinville, Chatauque County, (in a valley,) 1588 ‘ 
Summit between Elm Creek and Little Valley Creek, 
Cattaraugus County, - - - - - 1725 
Summit between Big and Little Valley Creeks, - 2180 “ 
ee eS Cayuga Lake and Susquehanna River, 981 “ 
ie ce Seneca Lake and Chemung River, 890 “ 
ai a the sources of the Alleghany and the 
waters of Lake Erie, at the lowest pass, - - 1200 “ 
The ledge of Niagara limestone causing the cataracts 
of Niagara, Genesee, Oswego and Black Rivers, a we 
Height of land between Buffalo and Lewiston, 640 “ 
Hs “between Buffalo and Lockport, - 590 “ 
Mohawk, at Little Falls, - - - - - 385 * 
Hills adjacent, - - - - - - OSTA 
Round Top, Catskill Mountains, - - - 3804 “ 
Summit on Welland Canal, - - - - 624? ‘ 
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 of the United States would 
Vol. xtv, No. 1.—April-June, 1843. 3 
