40 THE HABITS OF THE SALMON. 



similar obstructions not one would find its way 

 to the upper waters of most rivers in the north of 

 Scotland until much later on. I am convinced 

 that there can be but one reason for this, and none 

 other, namely, that the climate of Ireland by being 

 much warmer than that of Scotland, the tempera- 

 ture of the water is higher. But the rule as 

 to temperature in that country does not apply 

 everywhere exactly alike ; for instance, if we take 

 the Erne and the Bann, we find that the habits of 

 the fish are altogether different. The Erne is fed 

 by two large lakes, the upper and lower Lough 

 Erne, whilst the Bann is fed by the largest lake 

 in Ireland, Lough Neagh, and yet few if any fish 

 find their way into Lough Erne before May, or 

 into the Bann before autumn. With all that, they 

 run through the Bundrowse river early in spring into 

 Lough Melvin, which is only a short distance south 

 of Ballyshannon, as they do into the Bush — an in- 

 significant river, not fed by any lake at all, 

 about the same distance from Coleraine. How do 



