REARING 



157 



No. 7). It is rectangular in shape, and being made 

 narrower by at least an inch than the hatching- 

 trough, a sufficient space is left to allow the water to 

 circulate through the side perforations. 



Lowered into one of the compartments until the 

 bottom of it is immersed to a uniform depth of two 

 inches, the tray is held suspended in this position by 

 two adjustable slings, each made of a single piece 

 of stout wire bent to fit the tray. The ends of the 



slings rise about two inches above the top of the 

 tray, and, being bent outwards and pointed, are 

 pressed into the sides of the hatching-box, where 

 they are held fixed by the elasticity of the wire. The 

 cross section (fig. 9) shows the tray slung in position 

 by this simple but effective device. 



The exposed side view given in the larger illus- 

 tration (fig. 8) shows that the tray is so adjusted that 

 the bottom of it lies parallel with the surface of the 



