ARTIFICIAL BREEDING OF SALMON. 197 
wire-work, the same height as the sides, which are 
strengthened by two transverse pieces of wood. All 
the wood-work should be of well-seasoned material, 
; Fig. 1. 
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and those parts which come in contact with the water 
should be glazed, as any resinous or pitchy substance 
in the wood would prove injurious to the ova. I should 
mention that the first compartment into which the 
water falls should be furnished with a network lid of 
zinc wire, which forms the bottom of a framework 
three or four inches high, so as to prevent the water 
running into the next compartment except through 
the holes in the zinc lid. Thus the larve of destruc- - 
tive insects, worms, &c., will be kept out. The upper 
end of the case should stand two inches higher than 
the lower end. The water which runs out from the 
last compartment is prevented running out the whole 
