84 



THE SALMON RIVERS OF SCOTLAND 



Lyon is seen to be colder than the Upper Tay by 3, and in 

 February by 2, after which the two Tay curves and the Lyon 



Tay at Grandtully 



Tay at Perth Lyon.- , Onrry 



Weekly Mean Temperature of the River Tay, Upper and Lower Water, and Tributaries of 



Lyon and Garry, 1902. 



curve are in close conjunction till the end of April, when, with a 

 mean temperature ranging from 40 to 45, spring fishing may be 

 expected to be at its best. 



