Natural History of the Grayling. 189 



that would not bear the carnage from foreign 

 countries at that time, and probably the monks 

 knew nothing of the mode of importing the 

 ova. The probability is that they are indige- 

 nous in those streams which are particularly 

 suited to them, in having rocky or gravelly bottoms 

 and alternate pools and runs, but they also can 

 live and thrive in other rivers not having these 

 peculiarities. 



In England, the Grayling is found, according 

 to Yarrell and others, in the following rivers : In 

 Hampshire and Wiltshire, the Test, the Itchin, and 

 Avon. 



In Herefordshire. The Lug, the Wye, the Irvon, 

 and the Arrow. 



In Shropshire. The Teme, the Clun, and the 

 Corve. 



In Staffordshire. The Trent, the Dove, and 

 the Wye. 



In Derbyshire. The Dove and Wye. 



In Merionethshire. The Dee. 



In Yorkshire. The Derwent, the Ouse, the 

 Wharfe, the Wiske. 



In Cumberland. The Eden and the Esk. 



The Grayling is not found in Ireland or Scotland. 



The name is said to be a corruption of gray lines, 

 from the longitudinal lines along the body. It is 

 called Oumer, in Northumberland, and the smaller 



