ON THE GROWTH OF THE SALMON 
(Salmo salar), 
AND OF THE SEWIN 
(Salmo cambricus). 
igs 
To Mr. Joun Suaw of Drumlanrig belongs the merit 
of having successfully developed the natural history of 
the small fish denominated Parr, whose economy, 
prior to the enunciation of his discoveries, was in- 
volved in obscurity, and was the cause of much 
perplexity and hypothetical reasoning among British 
ichthyologists. By a series of well-conceived and 
skilfully conducted experiments he has not only 
proved that the Parr is neither a hybrid nor a species 
sui generis, but has clearly established the interest- 
ing and important truth that it is the young of the 
Salmon. 
Residing in the immediate vicinity of the river 
Conway, for some years past my attention as a natu- 
ralist and a fly-fisher has been directed to the finny 
inhabitants of its waters and to the Salmon in par- 
ticular. In the course of my researches several 
remarkable facts relative to the latter species in its 
