15 



ducted. The experimenters were Dr. Tlieodatns Garlick and Pro- 

 fessor H. A, Ackley. They brought their parent trout alive 600 

 miles, from the Sault Ste. Marie, to Cleveland, where they took and 

 hatched the ova. The results were given by Dr. Garlick in a paper 

 read by liim before the Cleveland Academy of Natural Science, Feb- 

 ruary IT, 1854. 



Rearing White Fish. 

 In reply to a correspondent about rearing white fish, we will say 

 that it certainly will not pay to raise them artificially, as trout are 

 raised. The best thing to do with the young white fish after tlie sac 

 is absorbed is to turn them loose into some large pond or lake, where 

 they will gvoy^ pro hono puhllco. Mr. Samuel Wilmot, of IN'ewcastle, 

 Ontario, Canada, has had good success, we believe, in rearing the 

 young fry of the white fish, and if our correspondent would like to 

 retain some to experiment with, we would advise him to apply to 

 Mr. Wilmot for directions about growing them. 



The Adipose Fin of the Salmonid^. 



Extract from lecture of Mr. Guelwer before the East Kent Natural 

 History Society, England : 



As to the small and posterior dorsal fin of this family being adipose 

 and devoid of fin rays, or, as emphatically asserted by the excellent 

 Yarrell, "in the smelt without any rays whatever," this is not strictly 

 correct. For though in this fish this fin is, as usual in the family, 

 small and rudimentary, not unlike a fatty layer in a thin skin-film, it 

 is quite destitute of fat, and is kept extended by a thickly crowded 

 set of parallel and very delicate rays, extending from the back of the 

 fish upward to the free margin of the fin, and often projecting a little 

 beyond it, as one may witness by the help of an achromatic object- 

 glass of half an inch focal length. These rays are indeed composed 

 of a peculiar glassy and homogeneous matter, like the intercellular 

 part of true cartilage, quite structureless and devoid of cells ; nor have 

 these rays any muscular provision for those motions which we know 

 to belong to true fins, neither have the rays of the adipose fin, as we 

 have seen, any resemblance in structure to the bony rays of the other 

 fins. Still, in the smelt at least, the so-called adipose fin is neither 

 fatty nor without any rays whatever. 



The Salmon-breeding Enterprise in Maine. 

 In 1868 we spent three months in New Brunswick, and built a 

 thoroughly-appointed salmon-ljreeding establishment on tlie Mira- 



