308 



On (he Fall of Hirers. 



subject, but still there are no naterjalls or other sudden de- 

 scents. 



There is another river in Scotland, the fall of which, al- 

 though larger, approaches nearly to that of the Jordan. 

 This is the famous border stream, the placid Tweed. The 

 entire length of this river is 96"4 English miles, and the total 

 descent is 1500 feet ; thus the average fall per mile would 

 be about 16 feet ; but the actual distribution of fall for the 

 different portions of the river is thus : — 



The affluence of Biggar Water is a very good limit be- 

 tween the upper and middle course of the Tweed ; the dis- 

 tance from that point to the sea is 80 miles, which is nearly 

 the same as the Jordan between the two lakes. We see from 

 the preceding table that the fall of the Tweed within its 

 middle and lower course approaches in many places very 

 mearly to the supposed average fall of 12 feet in the Jordan, 

 as near as 11-4 feet; and in a short distance from Biggar 

 Water to Altarstone, the rate of fall reaches even 14-2 feet 

 per mile ; and yet from the affluence of Biggar Water to the 

 sea the Tweed possesses neither waterfalls nor rapids ; and 

 small boats, such as are used in salmon-fishing, are freely 

 navigated. 



Thus the fall of the Jordan of 12 feet per mile, even with- 

 out waterfalls, does not present such a great contrast to the 



