272 AMERICAN FISH CULTURE. 



plans for the purpose become more matured, the young 

 salmon will be put in the river by the hundred thousand 

 instead of by the thousand. Then we shall without doubt 

 have returns, which well correspond in some more adequate 

 mea3ui;e to the great opportunities which are presented to 



VIII. 



CLOVE SPRING TROUT PONDS. 



Mr. Christie takes his supply from two springs of unvary- 

 ing temperature, discharging seven hundred gallons a 

 minute. They are situated on the brow of a pretty hill, 

 shaded by fine old oaks and wide-spreading sugar maples, 

 about twenty-five feet above the level of the meadow below. 

 Although fiowing through strata of limestone, the water is 

 of the kind termed " soft." Before the door of the dwell- 

 ing-house he is erecting in the grove, and on the slope of 

 the hill, stretch the two larger ponds parallel with each 

 other, and divided by embankments ten feet wide. The 

 upper, which he calls pond No. 2, is about two hundred and 

 twenty-five feet long by twenty wide, the depth averaging 

 something over four feet. The lower, which is pond No. 3, 

 is of the same length, thirty feet wide, and varying in depth 

 from five to twelve feet. Each pond has an outlet in the 

 bottom to draw it off, should it be necessary to do so at any 

 future time. 



* A short time after the salmon began to be hatched at the Cold 

 Spring Ponds, they received a visit from Theodore Lyman, Esq., 

 the secretary of the New England commissioners, who carried spe- 

 cimens of the embryos of both eggs and young fry to Prof. Agassiz, 

 by whom very accurate drawings were taken of the embryos in dif- 

 ferent stages of development. The eggs and young fish themselves 

 were preserved in alcohol, and can now be seen on the shelves of 

 the Museum of Comparative Zoology at Cambridge. 



