164 



AMERICAN FISH CULTURE. 



Figs. 1, 2, 7. — Green's patent hatching box seen from the side, end and bottom. 

 Scale, l-20th. a, side floats 3.4" long ; 2* by 3" square, set with screws. 6, bottom 

 cross bar, bevelled, to tlircav the current upward, c. wire-net bottom 14 wires to 

 an inch, d, trap in hind end for escape of young fish, corered by wire-net, 8 to 

 an inch, and with a covering slide, e, anchoring cord. /, water-line. G, spawn. 



and heaped up, whereby many were spoiled for lack of 

 fresh water and motion. The best that this box would do, 

 was 90 per cent., while often it would hatch only 70 or 80 

 per cent. 



" The spawn-box he at last hit on is as simple as in- 

 genious. It is merely a box with a wire-gauze bottom, and 

 steadied in the water by two float-bars, screwed to its sides. 

 These float-bars are attached, not paraUel to the top line 

 of the box, but at an angle to it, which makes the box 

 float with one end tilted up, and the current striking the 

 gauze bottom at an angle, is deflected upwards, and makes 



