94 FISH AND FISHINO IN SCOTLAND. 



sources to the junction with the sea. Throughout the whole 

 range they uniformly take the same food, that is, the food of the 

 common trout. 



I have it recorded amongst my notes that parr, about two and 

 a-half inches long, are very numerous in March in the Annan, as 

 far up as Hallheaths. Many of these are probably young salmon, 

 mistaken for parrs. 



During the course of last summer, I received from my friend, 

 Mr. Young, of Invershin, a present of five small fishes, four of 

 which he considered to be smolts, and one a parr.* On examining 

 these with some care, I found that in some the caeca were in two 

 rows ; in others, in three ; about fifty-two in all. The vomerine 

 teeth presented a double interrupted mesial row (as in the trout) , 

 varying from sixteen to twenty-four. In some, the transverse 

 teeth on the chevron were distinct ; but in others this could not 

 be determined : or, at all events, the transverse row present did 

 not extend beyond the range of the mesial rows. In the specimen 

 which Mr. Young considers to be a parr, I found the vomerine 

 teeth as follows : 



Mesial in a double row and alter- 

 nating, as in trout ... 8 8 = 16 



Anteriorly on the chevron or transverse teeth . . 4 



20 



Audi alter am partem ; for this reason I subjoin a letter addressed 

 to a kind friend one, if I recollect right, of my former students; 

 also one from my esteemed friend of Invershin : 



" My dear John, I have to acknowledge the receipt of your 

 letter, and would have answered the same ere this had not my 

 shooting excursions interfered more or less. However, regarding 

 the parr and salmon, I have studied the subject much, and indeed 

 have assisted Mr. Gillom with his experiments, closely, ever since 

 1838, and neither of us entertain the slightest doubt but that 

 the parr becomes salmon the third year after being spawned. 



" We conduct our experiments in the following manner : A 



* Mr. Young considers the parr as a distinct species of trout. The ob- 

 jections to this view are solid and innumerable. 



