288 TRANSACTIONS OF THE 



a remunerating speculation to the English Salmon Fishery Com- 

 pany, on the beautiful little river Dart, in Devonshire. 



The experiment in Perthshire, in demonstrating Mr. Shaw's 

 experiments, show, on the sea trout, the following : He cut off 

 the adipose fin of 524 of them, in the summer of 1834; in 1835 

 he recaptured 68 of them, averaging two and a half pounds' 

 weight. On these he put a second distinctive mark, and returned 

 them to the river. In 1836 he recaptured about one in twenty 

 of them, and they averaged four pounds weight. Marking these 

 the third time, he returned them to the river. On the 23d of 

 August, 1857, he recaptured one of them weighing six pounds. 



1st. Of the marked salmon at the Stormontfield pond, foiu* per 

 cent, were recaptured either as grisle or salmon. 



2d. More than 300,000 were reared and liberated, and forty 

 out of every thousand were recaptured. Hence twelve thousand 

 of the salmon taken in the river Tay were the pond bred fish. 



3d. The annual average of salmon and grisle taken in the Tay, 

 is seventy thousand. So that during the last two years, nearly a 

 tenth part were artificially bred. 



We desire to impress upon all persons living near canal, lake 

 or stream, that by transporting there the ova of fish, any body of 

 water can be stocked with valuable kinds of fish. A great field 

 is opening for fish. 



At Stormontfield, the apparatus for breeding is rather cumbrous. 

 But the one patented by Boccius, which contains twenty-five thou- 

 sand salmon ova, is onlv two feet long, by one foot broad, and 

 requires but four inches depth of water. 



Dr. Esdaile suggests dispensing with both boxes and gravel, 

 depositing each egg in a little cup, punched in a plate of zinc, or 

 in a slab of coarse stone w^are. Wh}^ not of strong, coarse glass, 

 cheap, in which small hollows can be easily made for each ovam? 

 He calculates that twenty thousand ova can, at a small expense, 

 be deposited in about three feet square. 



We advise an examination of the apparatus used by M. Coste. 



At the late exhibition in the Champs Elysees, Paris, there were 

 among other things, an interesting one of artificially bred fish — 



