20 



TROUT CULTURE 



wire netting, of such a size that the eggs may rest on the 

 wires, but that the young embryo, on emerging from 

 the shell, can pass between the wires and swim over 

 the edge of the box through an opening cut in the side 

 of the top edge, and fitted with a lip or spout, into a 

 receiving box placed under it. This has a sloping 

 wire-gauze screen, very accurately fitted, to prevent 

 egress therefrom. 



THE HOLTON BOX. 



This receiving box may be one of the " feeding " 

 boxes afterwards described, and may be of any dimen- 

 sions desired, in proportion to the number of eggs to 

 be hatched, and the amount of water available. The 

 trays, which should fit easily, are kept from floating by 

 wedges, as shown in fig. The water is so arranged 

 that it shall come in at the bottom and flow off by the 

 spout at top ; the wires breaking the current and thus 

 distributing the supply throughout the apparatus. 



In starting the apparatus a small stream of water 

 should run through it a few days before it is actually 

 wanted for use, in order to season it and remove any 

 taint from the paint or other dressing used for its pro- 

 tection ; black asphalte varnish being used in America, 

 whilst silicate paint, of the Silicate Paint Company, 

 Cannon Street, London, E.G., is the favourite for such 

 purposes in England. When sufficiently seasoned, all 



