15 



ever, to procure an abundance of small fish, especially 

 of those which derive their principal sustenance from 

 aquatic plants. 



The average weight of the trout, produced by the 

 above means, is about four and a half ounces at the end 

 of the second year, and nine at the end of the third. 



Modifications of the rules here given may be at- 

 tempted. Thus, the holes in the box may be made so 

 large as to enable the fish to escape when so disposed, 

 which would do away with the trouble of watching 

 them : secondly, they may be placed and brought up 

 in large boxes containing coagulated blood, or other de- 

 scriptions of food, so as to make a comparison between 

 their growth and those left at large. In fact, innu- 

 merable experiments may be attempted ; but they will 

 suggest themselves to the mind of the operator practi- 

 cally acquainted with fish. 



When the trout are destined to stock a river, it is 

 advisable to produce them in one of its tributaries, 

 where they will remain until they are active or strong 

 enough to escape or resist the enemies which they find 

 in the deeper waters of rivers. 



If they be destined for reservoirs or ponds, care must 

 be taken not only not to place voracious fish with them, 

 but to separate them according to their ages, those of 

 three years from those of two, and those of two from 

 those of one. The reason for this is, that the larger 

 trout devour the smaller ones. 



VI. 



It has been already stated, that in the course of a very 

 short time Messrs. Gehin and E/emy, by the application 



