REARING. 



47 



water flowing over has a clear run ; there may be one 

 or more divisions for the separation of species, each 

 division and, if none, the outlet being guarded by 

 a fine perforated zinc screen, securely nailed to fillets 

 of wood and the bottom of the trough. These fillets 

 slope with the stream at an angle of about 40 from 

 the horizontal ; and the spout, of metal, is securely 

 fitted and water-tight. The interior of the box is 

 dressed with black varnish or silicate paint. The box 

 is strengthened and bound together by cross-pieces 

 dove-tailed in at the bottom, which is fitted by tongue 

 and groove about one inch from the lower edge of the 

 boards which form the sides ; the ends are also put in 

 after the same manner. Cross-bars are also dove- 

 tailed in on the top edge, and on these rest the lids, 

 which are merely laid on, and so cut as to leave about 

 one inch in the middle open for light and air, and as 

 an aperture for feeding. Fifteen inches will be found 

 a convenient width. 



The exterior and lids may be painted or stained and 

 varnished to taste. 



FEEDING BOXES. 

 A box, B tap, cf rubber-hose, D water chamber, E zinc, F division, c outlet. 



