76 



DOMESTICATED TROUT. 



whereby the whole set may be raised or lowered as may be 

 necessary in removing or replacing them, as hereafter more 

 fully described. There is a vertical recess cut in the sides 



of the case to receive 

 the straps. The latter 

 are perforated at dis- 

 tances corresponding 

 to the vertical depth 

 of each tray ; and the 

 straps, if made of met- 

 al, may be provided 

 with a suitable pin a ; 

 but if leather is used, 

 they may be hooked 

 upon a fixed pin in the 

 upper edge of the case. 

 A pipe P may be used to conduct the water from the spring 

 or fountain into the bottom of the case ; or a water-cham- 

 ber may be formed entirely across that side of the case and 

 also across the bottom. This latter construction is rather 

 preferable for all except the first case in each tier, and, in 

 fact, would not be objectionable for that. To insure a 

 thorough distribution and circulation of the upward flowing 

 current of water through all parts of the trays, I provide the 

 deflector h, which may be spherical, as shown, flat, or any 

 other suitable shape. It is supported directly over the inlet 

 opening d upon suitable standards n. The discharge spout 

 or trough f conveys the overflowing water to the descend- 

 ing water channel or chamber of the next succeeding case. 

 " The case may be made of any desired size ; but I pre- 

 fer them about eighteen inches to two feet square, and from 

 two to four feet or more in height, according to the amount 

 of fall afforded to the water from the spring or fountain. 



" The cases may be arranged in tiers the whole length of 

 the floor of the hatching house, and the water overflowing 



