122 SALMON FISHERY. 



troughs, fo that each trough may have its proper 

 quantity of water conveyed into it ; or it may be 

 managed by means of brafs cocks ; but this is left 

 to every one's own choice, as the mofl convenient 

 method will be foon found out. 



9. After the box or trough is properly fmifhed, 

 it muft be placed horizontally upon two legs of 

 wood, ftone, or brick ; and within upon its bottom 

 put fome; clean-wafhed gravel, level, about the fize 

 of peafe and beans, two inches high ; afterwards 

 fprinkle fome coarfe gravel or pebbles over it, the 

 fmalleft of them of the fize of beans, and fome big- 

 ger than hazel-nuts. This lafl is done, that upon 

 the furface of the fmaller gravel, many deep holes 

 may be formed to prevent, that the continual mo- 

 tion of the water may not carry away the eggs, 

 but that they may remain, where they were at 

 firft fprinkled in. 



10. Then let the water run into the trough, 

 and rife it higher or lower, according to the in- 

 ftru&ions, No. 4, fo that the water may cover the 

 gravel always one or two inches. Take care not 

 to let it run too rapidly, left it may carry off the 

 eggs, or difturb them ; for they ought to remain 

 unagitated between the pebbles. 



This done, you have accomplifhed all that is 

 neceflary to the apparatus, for breeding trout and 

 fahnon. 



1 1 . The time of fpawning is ufually the month 

 of November, at which time the falmon, both male 



and 



