160 THE WONDERFUL TROUT 



rivers on the west coast, known to us, are 

 the Lochy and the Awe, and, formerly, the 

 Gruinards. Their compensating qualities 

 are: length of courses, large reservoirs of 

 fresh-water lochs throughout their courses 

 and near their sources, rapidity of descent, 

 complete aeration, and consequent warmth, 

 more nearly assimilating to the sea lochs 

 which they meet, and thus causing the 

 equable temperature between fresh and salt 

 water which is so necessary before migratory 

 fish will ascend. This is not a statistical 

 paper, but the materials to prove the general 

 acting of this law are not wanting, but only 

 withheld. And questions about the compara- 

 tive rates of speed and flow and aeration of 

 certain rivers of the east coast, as compared 

 with certain other rivers of the west coast, at 

 once suggest themselves ; but we believe these 

 can be answered statistically by any one who 

 will take the trouble to collect and arrange 

 the materials which have from time to time 

 been published. 



If this were done thoroughly by those hav- 

 ing the knowledge, accurately formed by 

 many years' personal inspection of, and 



