On the Fall of Rivers. 



315 



bifurcation of the two rivers — a bifurcation which differs 

 from other larger (and more important) examples only so far 

 as to depend upon the state of water in the Clyde. I give 

 the words of the attentive angler who describes it :* — " It is 

 a singular circumstance that salmon and their fry have occa- 

 sionally been taken in the upper parts of the Clyde, above its 

 loftiest fall, which, being 80 feet in height, it is utterly im- 

 possible for fish of any kind to sunnount. The fact is ac- 

 counted for in this way. After passing Tinto Hill, the bed 

 of the Clyde approaches to a level with that of the Biggar 

 Water, which is close at hand, and discharges itself into the 

 Tweed. On the occasion of a large flood the two streams 

 become connected, and the Clyde actually pours a portion of 

 its waters into one of the tributaries of the Tweed, which is 

 accessible to and frequented by salmon." 



V. The Dee. — We have already noticed at some length 

 the fall of this river. The results for the Dee I have based 

 upon levels ascertained by repeated barometrical measure- 

 ments by Dr Skene Keith and Dr Dickie of Aberdeen, which 

 have been kindly communicated to me by the latter. This 

 gentleman also confirms my statements by his personal know- 

 ledge of the Dee — that it does not exhibit any cataract from 

 its mouth up to the Linn. 



The Fall of the Dee. 



* Stoddart's Angler's Companion for Scotland. 



