ON THE GRAYLING. 21 



Temperature, both atmospheric and aqueous, 

 no doubt affects both the food and fish, as also 

 may the chemical properties of the stratum over 

 which the stream flows ; the mineral held in 

 solution by the fluid which he breathes cannot 

 fail to affect his constitution in some measure. 



But there exists no authority for the localities 

 of the Grayling at all comparable with Sir H. 

 Davy, who " has fished much in, and inquired 

 much respecting the places where it is found." 

 At p. 221 (Salmonia) he says: "In the Test, 

 where the Grayling has been only recently 

 introduced, they have sometimes been caught 

 between three and four pounds ; in this river I 

 never took one above two pounds, but I have 

 heard of one being taken of two pounds and a 

 half The Grayling is a rare fish in England, 

 and has never been found in Scotland or 

 Ireland ; and there are few rivers containing all 

 the conditions necessary for their increase. I 

 know of no Grayling river farther West than 

 the Avon in Hampshire ; they are found in 

 some of the tributary streams of this river 

 which rise in Wiltshire. I know of no river 

 containing them on the North coast West of the 

 Severn ; there are very few only in the upper 

 part of this river, and in the streams which form 

 it in North Wales. There are a few in the Wye 

 and its tributary streams. In the Lug, which 



