GRAYLING. 165 



teen miles higher up, between Corwen and 

 Bala. 



POIET. It may have been a fish im- 

 ported from the continent, and carried to a 

 number of rivers, only a few of which may 

 have suited its habits, and there it has 

 remained and multiplied. 



HAL. There may be truth in what you 

 are now imagining, for the grayling requires 

 a number of circumstances in a river to 

 enable it to multiply. 



POIET. What circumstances are these? 



HAL. A temperature in the water which 

 must be moderate neither too high nor too 

 low. Grayling are never found in streams 

 that run from glaciers at least near their 

 source; and they are killed by cold or heat. 

 I once put some grayling from the Teme, 

 in September, with some trout, into a con- 

 fined water, rising from a spring in the yard 

 at Downton ; the grayljng all died, but the 

 trout lived. And in the hot summer of 

 1825, great numbers of large grayling died 

 in the Avon, below Ringwood, without 

 doubt killed by the heat in July, 



POIET. But I have heard of grayling 



