104 THE NEW AET OF BREEDING FISH. 



the conductor of the diligence, who kept them two 

 days and a night in a vase. These fish hatch even 

 in turf-pits ; so that they can be easily propagated 

 in those of Picardy, and in the least favorable waters. 

 Their importation, then, will be a service rendered 

 to fish-breeding. 



In hatching fish in new waters, trials of their ac- 

 climation can be successfully made. I may give here 

 striking examples in citing my experiments at the 

 College of France, under circumstances where, I did 

 not promise myself any success. Young salmon, 

 hatched in my laboratory, and placed afterwards in an 

 artificial pond fed by a single stream of the water of 

 the Arcueil, grew as well as if they had lived in the 

 Rhine, as I was able to satisfy myself by a compari- 

 son. They are hardly four months old, and already 

 their length is 60 milemetres, of which they have 

 gained 12 during the last twenty-four days ; a re- 

 markable growth, which may be attributed, without 

 doubt, to the particular nourishment they receive, 

 of which they show themselves greedy. 



But to return to our hatching apparatus, and the 

 eggs which are in progress of development : — Here a 

 second problem is presented — ^what becomes after 

 birth of the young fish hatched by millions in the 

 narrow drains where the eggs were deposited ? This 

 second problem will not be more difficult to answer 

 than the first. The arrangement of the locality will 

 answer for all exigencies. As soon as the newly- 

 hatched fish are strong enough to swim, they will fol- 



