68 Trout Culture. 



at each end, have many advantages, especially 

 where the open stream itself would be objection- 

 able or unsuitable, either from the presence of 

 too many natural enemies, or from other causes. 

 Reference was made to this matter at the end of 

 Chapter III., so that only a few hints on construc- 

 tion need be given here. The best way to set to 

 work, in the writer's opinion, is to determine the 

 length of the box, or boxes, by that of the 

 longest planks to be obtained in the vicinity, as 

 the expense involved in an extra length of a few- 

 feet is the merest trifle, whereas the benefit 

 derived from the extra space thereby obtained 

 is very great. Supposing the water be a foot 

 deep, and the box four feet wide, every extra 

 foot of length gives the fry four cubic feet more 

 swimming space, or twenty-five gallons more 

 water to spread about in. 



The length and width determined, the con- 

 struction is so easy that any man about the 

 estate who has the most elementary notions of 



