1212 fisheries of the united states. [58] 



Green's hatching-box. 



A small model of the Green hatching-box. 26,997. Gift of Seth 

 Green. 



b. APPARATUS UTILIZING WAVE-ACTION. 



Wright's submerged hatching-box. 



A cubical box, with a hinge cover of wire cloth, the sides being of 

 galvanized iron ; the bottom, which is of the same material, 

 being provided with circular openings an inch in diameter, 

 each covered with valves opening upward to admit water from 

 beneath. In the interior of the box, an inch above the valves, 

 is a wire tray upon which the egg are allowed to rest, and 

 through which the water can readily pass. The sides of the 

 box are prolonged downward to form an expanding riin. The 

 whole is suspended from a float and hekl in position by means 

 of a small weight fastened to the bottom. The float is lifted 

 upon the crest of the waves drawing the box through an equal 

 distance, and as it descends into the hollow the valves open 

 allowing the water to rush up through the opening and among 

 the eggs, closing again to prevent suction as the box rises. 

 Length, 10 inches ; width, 10 inches ; depth, 12 inches. Pa- 

 tented by Isaac H. Wright, of Baltimore, Md., August 20 ? 

 1878. Gift of Isaac H. Wright. 39,462. This box was in- 

 vented for hatching eggs of the shad. It is claimed to be suit- 

 able for exposed streams where the current is slight but where 

 . the waves are of considerable size. 



C. APPARATUS REQUIRING HEAD OR HYDRANT PRESSURE. 



Chase's hatching-jar. 



A cylindrical jar of glass, with a metal rim notched at one side and 

 provided with a wire screen for retaining the fish. The water- 

 is introduced through a glass tube at the bottom and passes 

 upward through the eggs. Height, 16 inches ; diameter, 6 

 inches. Invented by Oreu M. Chase, Detroit, Mich. 39,142. 

 This jar is extensively used for hatching eggs of the whitefish. 

 When the embryos are developing, the outflow gate remains 

 open, and through it any dead eggs which are carried upward 

 by the current escapes, thus preventing the injurious effects 

 which arises from fungus and dead eggs. 



Clark's hatching-jar. 



Old style. A cylindrical jar of glass, with a metal rim notched at 

 one side, and provided with a movable wire screen, which is 

 open while the embryo are developing, to allow the escape of 

 dead eggs, but closed when the hatching begins, to prevent the 

 escape of the fish. The water is introduced through an open- 



