APPENDIX. 265 



The Cold Spring Trout Ponds are situated in Charles- 

 town, N. H., which is a town on the Connecticut river, 

 about 40 miles north of the Massachusetts line. The 

 ponds and hatching-works are built on two streams, the 

 smaller of which, with a hatching capacity of about five 

 millions, is used chiefly for hatching purposes. On the 

 larger stream are the spawning-beds and the ponds for the 

 breeding trout. The hatching-houses are located at the 

 head of the smaller stream, just where the springs issue 

 from the ground. The springs are peculiarly well adapted 

 to their purpose, being very large and of even temperature, 

 standing at about 47 Fahrenheit from the first of 

 December to the first of May. As is the case with other 

 springs running at a considerable depth below the surface, 

 they are a trifle warmer on the first of December than on 

 the first of May. The success which has been met with 

 in these hatching-works is of the most encouraging kind. 

 In some of the most favorably situated boxes, containing 

 trout spawn, the loss was almost nothing, hardly three per 

 cent., while in the salmon beds it was even less, being 

 under one per cent. 



The whole amount hatched this season was between one 

 hundred and fifty thousand, and two hundred thousand 

 trout, and ninety -nine per cent, of the impregnated salmon 

 eggs deposited here by the New Hampshire Commission- 

 ers. The water, however, on this stream is rather too cold 

 for growing trout well, so after they are hatched and begin 

 to feed, they are taken down to the larger stream, also fed 

 by perennial springs, but warmer in the summer, where 

 they are kept in rearing-boxes until winter. There is now 

 a large stock of breeders on this stream, which will be 

 increased by the next spawning season to thirty thousand, 

 some of them varying from a half a pound in weight, to a 

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