-1830] 



WRITINGS OF JOSEPH HENRY. 



19 



No. VII. — Table of Ascents and Descents from Great Sodus Bay, on Lake 

 Ontario, along Seneca Lake and the route of the Chemung Canal to New- 

 town, on the Chemung or west branch of the Susquehanna River. 



Route. 



Miles. 



Feet. 



Lake Ontario, at Great Sodus bay 



Lj'ons, on the Erie canal 



Outlet of Seneca lake, near Geneva 



Along the lake to its head 



Summit between the lake and Chemung river. 

 The Chemung at Newtown 



12 



34 



8 



10 



15 

 27 

 Gl 

 69 

 79 



rises 170 



rises 46 

 level 



rises 443 



falls 53 



231 

 401 

 447 

 447 

 890 

 837 



No. VIII. — Table of Ascents and Descents from. Lake Ontario along the valley 

 of the Gcnessee River, to the mouth of Black Creek in Allegany County, 

 and thence to Olean, on the Allegany River, along Oil and Black Creeks. 



Eoute. 



Miles. 



Feet. 



Mouth of Genessee river 



Erie canal, at Rochester 



Squaque hill 



Gardow flats 



Head of the Great Falls in the town of Nunda. 



Mouth of Black creek 



Summit level between Black and Oil creeks*. 

 Olean on the Alleganv 



29 

 6 

 8 

 16 

 10 

 13 



37 

 43 

 51 

 67 

 77 

 90 



231 

 506 



574 

 650 

 1103 

 1265 

 1486 

 1408 



No. IX. — Table of Ascents and Descents from the tnouth of Oak Orchard 

 Creek, on Lake Ontario, in nearly a direct line to Olean, on the Allegany, 

 by the route of Batavia, the Tonnewania Creek, Lime Lake, and the 

 valley of Ischua Creek. 



Route. 



Lake Ontario, at the mouth of Oak Orchard 

 creek 



Albion, on the Erie canal . 



Tonnewanta creek, at Batavia. 



Attica, along Tonnewanta creek 



Dividing ridge between Tonnewanta and Cat- 



taragus creeks . 



Lime lakef 



Olean Point, on the Allegany, along the valley 



of Ischua and Oil creek 



Miles 



8 

 25 

 36 



54 

 68 



95 



Feet. 



rises 

 rises 

 rises 



rises 

 rises 



275 



377 



71 



526 

 143 



falls 214 



231 

 506 

 883 

 954 



1480 

 1623 



1409 



♦This summit is a marsh — the discharged waters of which find the level 

 of the ocean in the Gulf of St. Lawrence and the Gulf of Mexico. 



fThis lake, according to Mr. Roberts' report, is 1642 feet above tide. Ac- 

 cording to the same report, Beaver lake, in the town of China, is 1704 feet. 



