FOR PLEASURE AND PROFIT. 



131 



nient distance from, the bottom of the box by small iron sup- 

 ports fastened 1 in the sides of the- trays, as presently explained. 

 These are marked b in the drawing. Ths handles to the trays 

 are shown in section at a. The level of waiter in the box 

 is shown by the dotted line F E. Some importance must be 

 attached to the height at which th water is maintained in 

 the hatching box during the process 1 of incubation. Suppos- 

 ing the depth of the box to be 8in., then the top of the trays 

 should be fin. from the top of the box, the depth of tlie trays 



A HATCHING BOX. 



should be 4in., and the bottom of the trays should be Sin. 

 clear from the bottom of the box. This leaves Jin. for 

 " play," and for the thickness of the sheet of perforated zinc 

 which forms the bottom of the trays. The spout B should be 

 so arranged that the water level in the box is 5in. above 

 the bottom of the box. This permits of Sin. depth of water 

 under the bottom of the trays, and 2in. of water flowing over 

 the eggs in the trays 1 . Th correct volume of water necessary 

 to flow through the boxes is referred to in my remarks on in- 

 cubation. Each hatching box should be fitted with an outlet 

 plug-hole and plug, shown at G in Fig. 34 ; this to enable ea.ch 

 box to be emptied and cleaned or otherwise dealt with inde- 



K2 



