Natural History of the Grayling. 189 



that would not bear the carriage 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 indigenous 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 pecu- 

 liarities. 



In England, the Grayling has been introduced 

 into almost all our rivers and streams which are 

 supposed to be suited to its habits, and has thrived 

 well in many of them. 



In Hampshire, Wilts, and Berks it is to be 

 found in the Anton, the Avon, the Itchin, the 

 Kennet, the Lambourne, the Test, the Wyley. 



In Herefordshire. The Lug, the Wye, the 

 Irvon, the Arrow. 



In Derbyshire. The Dove, the Wye. 



In Cumberland. The Eden and the Esk ? 



In Shropshire. The Clun, the Corve, the Ony, 

 the Teme. 



In Staffordshire. The Blythe, the Churnet, the 

 Dove, the Trent, the Wye. 



In Yorkshire. Mr. Pritt (The Book of the Gray- 

 ling) says it is to be found in all the main rivers 

 except the Hodder and the Wenning. 



In Scotland. The Clyde and the Tweed. 



