ARTIFICIAL HATCHING OF SPAWN. 35 



about three-quarters of the width of the box itself. 

 At each end of every box a piece was cut out 

 six or seven inches in width, and three inches 

 in depth, and through these the water flowed into 

 each box. 1 The top cut, which first received the 

 water, being secured from foes without by being 

 covered with perforated zinc through which the 

 water flowed, and the further end one having a 

 zinc shoot to deliver the water ; and also a perforated 

 zinc face, not only to keep foes out, but the fish in. 

 Fastened over the cut in the lower end of the first box 

 was a short zinc shoot (5), to convey the water into 

 the next box over the corresponding cut, so that no 

 water should run to waste between the boxes. Thus, 

 when No. 1 box was fairly placed on a brick founda- 

 tion, so as to receive the water in the zinc trough 

 mentioned above, all that was required was to insert 

 the shoot at the other end of the box into the cor- 

 responding cut of No. 2 box, and slide No. 2 safely 

 and closely up into its place, and so on with Nos. 3, 

 4, and 5, &c. These boxes were then partially filled 



1 These openings were not carried all across the boxes, as the 

 shoulders left made an eddy very favourable as quiet resting-places 

 to the young fry when first hatched. If the stream be at all strong, 

 artificial eddies should be created, by sticking small pieces of per- 

 forated zinc upright in the gravel at intervals along the sides and 

 across the stream ; behind these the helpless fry can be in safety. 



D2 



