78 THE NEW AKT OF BREEDING FISH. 



as all varieties of the salmon family, can be preserved 

 a long time in vessels, the water of which is not even 

 frequently renewed ; but for this result they must 

 be placed in them immediately after birth, and in 

 the vessels must likewise be placed living aquatic 

 plants. I have made on this point numerous experi- 

 ments, which leave no doubt of the efficiency of this 

 method. I have frequently put two hundred young 

 salmon, or two hundred young trout, in a glass jar 

 containing no more than three quarts of water, which, 

 being renewed every three or four hours, I have thus 

 been able to send them great distances, to places 

 where it was believed these animals could not be 

 acclimated, and where they are now thriving. 



If, instead of taking the trouble to renew the 

 water from time to time, a continuous streain could 

 be introduced into it, there is no distance, no matter 

 how great, they might not be sent at this first stage 

 of their existence. I have kept in the College of 

 France as many as six thousand at a time, in wooden 

 boxes or earthen vessels not larger than eighty centi- 

 metres long, fifteen wide, and ten deep, with a 

 stream of water no larger than a straw. The cur- 

 rent made by this little stream was found sufficient 

 to preserve them for more than a month in as sound 

 a state as if they had been swimming in large 

 streams ; and I have them still in such vessels and 

 continue therein to rear them. Now, if the experi- 

 ments which I have just cited, prove that we can pre- 

 serve thus long in guch restricted space, such a pro- 



