I may here observe tliat I am indebted to the kindness 

 and liberality of Thomas Lister Parker, Esq. for a variety of 

 specimens, as well as for the requisite information concerning 

 them. Of the various fishes, when received, accurate drawings 

 were immediately made, and coloured representations of six 

 examples at different ages, in illustration of this subject, are 

 in preparation, and may be had distinct from this supple- 

 ment. 



A knowledge of the growth of young Salmon in a fresh- 

 water lake, as here described, and the experiment has sue-; 

 ceeded elsewhere,* may be useful to those gentlemen who 

 possess lakes near Salmon rivers from which they can supply 

 them with Pinks : whether the Salmon thus prevented going 

 to salt water will still retain sufficient constitutional power to 

 mature their roe, and by depositing it in the usual manner, 

 as far as circumstances permit, produce their species, would 

 be a subject worthy of further investigation. That the rate 

 of growth in young Salmon has some reference to the size of 

 the place to which they are restricted, as hinted when de- 

 scribing Mr. Shaw's experiments, receives further confirma- 

 tion in these river, lake, and well specimens. The Smolt 

 taken from the well in July 1838, where it had been con- 

 fined for eight months, was rather smaller in size at that 

 time than the Smolts in the Hodder in the preceding April, 

 though both were Pinks of the same year, namely 1837. 

 The Smolt taken from the lake in August 1838, which then 

 measured seven inches and a half, had also grown more rapid- 

 ly than that in the well, but had not acquired the size it 

 would have gained had it been allowed to go to sea. 

 Further, it may be observed, that the Salmon Peal from the 

 lake in August 1837, then eighteen months old, though per- 

 fect in colour, is small for its age; while that of July 1838, 

 or twenty-nine months old, is comparatively still more dcfi- 

 * See British Fishes, vol. ii. p. 21. 



