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.i 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 



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

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

 to the young fiy when first hatched. If the stream be at aU 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 



