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the name of Mississippi after its junction witli the 

 upper Mississippi. It flows 2700 English miles above 

 that junction, receiving thirty-three rivers above 100 

 miles long, and 1300 miles below, receiving twelve 

 such rivers, having a total course of 4000 miles and 

 forty five large branches. It is yet undecided whether 

 the Yellow Stone or the Western Missouri is the 

 principal upper branch. 



Length. From Pittsburgh to the mouth, it is 500 

 geographic miles in a direct course (60 to a degree) 

 and 960 in the regular course, equal to 1120 English 

 miles, (of 69^ to a degree;) but if the Monongahela 

 be deemed the main upper branch, the whole course 

 will be 1360 English miles, while if the Allegany 

 be considered as such, the whole length of the Ohio 

 will be found equal to 1405 such miles. 



Adjacencies. It flows through Pennsylvania as 

 far as Mill creek below Georgetown ; it divides after- 

 wards the state of Ohio, which lie[s] on the right bank 

 from Virginia ; this state extends on the left bank 

 as far as Sandy river, where Kentucky begins, and 

 it occupies the remainder of the left bank, as far as 

 the Mississippi. While the state of Ohio terminates 

 on the north side at the Miami river : the state of 

 Indiana follows as far as [I. 310] [70] the Wabash 

 river, and from thence the state of Illinois extends to 

 the mouth. 



Parts. The Ohio is naturally divided into three 

 parts, containing each two sections, the head branches 

 Alleghany and Monongahela form the two sections 

 of the first part. The second or upper part lies 

 between their junctions and the falls, being divided 

 into two sections by Letart's rapids ; while the third 

 or lower part includes the space below the falls, the 



