THE NEW ART OF BREEDING FISH. 103 



largement in a spacious basin, where the water in 

 question alone has access, and whither will come the 

 young fish when hatched, — another place of destina- 

 tion being in store for them. 



When this stream will have been so transformed 

 into a vast establishment, made after the plan I have 

 indicated, it should be covered with a glass roof like 

 a greenhouse, admitting the light, and formed of mo- 

 vable panes turning round, so that the air may be 

 readily admitted when deemed necessary. To this 

 should be added a little house, to protect the work- 

 men, where a workshop of all the necessary imple- 

 ments would be, and also a register of the results of 

 each day^s observations. The natural history of fish 

 so obtained, would offer invaluable details. When 

 this establishment would be ready, the problem would 

 be reduced, simply procuring eggs sufficient to fill it, 

 and thenqe to stock all the streams of France. This 

 would not be difficult to realize. 



Being on the frontiers of Germany, Messrs. Ber- 

 thol & Detzem are in communication with the fish- 

 ermen of the river and the great lakes where are fish 

 the most esteemed. These fishermen have underta- 

 ken to give them all kinds of eggs. Messrs. Berthol 

 & Detzem have already taken from Lake Federsee, 

 thirty-six gigantic fish, which so transferred, I have 

 seen in their basins. They are waiting now for a sup- 

 ply of young fish of this kind, which bear the. journey 

 so easily, that I obtained three for the College of 

 France, by simply putting them under the care of 



