THE NEW AET OF BREEDING FI8H. 57 



hatched more speedily and surely than in places 

 whnre the females deposit them, because they are 

 preserved from all variations of temperature and ac- 

 cidents that can retard, alter, or destroy them. Ke- 

 sults already obtained, after several years experience 

 in hatching trout and salmon, leave no doubt of 

 the efficacy of this process, or of its capability of 

 adaptation on the grandest scale ; for with some 

 slight modification, the machine I have described has 

 served as the model upon which was constructed the 

 vast apparatus of the establishment of Huningen. 

 To operate with it is neither difficult nor expensive ; 

 it can be used in a laboratory or on a farm, almost 

 without supervision. AU that is needed is a little jet 

 of water flowing continuously. 



If the machine I have just described seems too 

 complicated, one can be made like a single one of its 

 coinpartments. I have several times used a simple 

 wooden box, long and narrow, lined with zinc or lead, 

 or even an earthen fish kettle {plate ^,fig. 3.) The 

 eggs I have placed on the hurdles with which this 

 wooden canal or fish kettle was furnished, have 

 hatched in my laboratory as well as at the Chateau 

 d 'Osman, in the department of Orne, the waters of 

 which seemed to me well adapted for bringing up 

 salmon. A very fine jet will suffice to feed the cur- 

 rent, and when the fountain is emptied, it may be 

 filled again, and the operation be thus carried on 

 with little difficulty. It is not even necessary to 

 have always fresh water, for that once used and re- 



