D._ ARTIFICIAL PROPAGATION. 



VI.— Apparatus for the manipulation of eggs and young fish. 



7. Hatching apparatus and accessories. 



apparatus for heavy eggs — trough apparatus. 



a. APPARATUS WITH A HORIZONTAL CURRENT. 



Garlick's hatching-box. 



A simple trough, the bottom of which is covered with pebbles, on 

 which the eggs remain until hatched, the water entering through 

 a spout above and passing out through an opening protected 

 by wire cloth at the lower end. Length, 18 inches; width, 9' 

 inches ; depth, 6£ inches. Invented by Theodatus Garlick,Cleve- 

 land, Ohio, 1851. Presented by Theodatus Garlick. 39,498. 

 This is the first form of hatching apparatus used in the United 

 States. It was adopted by Dr. Garlick, who may justly be 

 called the father of fish-culture in America. Though simple, 

 the results obtained by its use were very satisfactory. 



Slack's hatching-grill. 



A series of rectangular boxes arranged in flights so that the water 

 passes readily from the highest through the intervening ones 

 to the lowest. Each box is provided with a tray composed of 

 glass tubings incased in a wooden frame, which contains the 

 eggs. Length, 21 inches ; width, 7 inches ; depth, 4£ inches. 

 Designed by J. H. Slack, of Bloom sbury, N. J., in imitation of 

 Coste's hatching-grill. U. S. Fish Commission. 57,158. The 

 water enters from the top near one corner, and after passing 

 through the box, goes out through the spout at the opposite 

 diagonal corner. The glass tubes are advantageously em- 

 ployed in hatching, as by their use the eggs are less liable to< 

 be injured from fungus or sediment. 



Stone's parlor hatching-trough. 



A rectangular box with a glass cover, inclosing a smaller box with 

 a double bottom. The inner box Contains three screens, two 

 of which are covered with cloth to serve as filters, the other 

 being of wire cloth for keeping the fish from escaping through 

 the outflow pipe. Outer box, 18 inches long, 5 inches wide,, 

 and 5 inches deep. Devised by Livingston Stone, of Charles- 

 ton, N. H. Presented by Livingston Stone. 39,463. The up- 

 1208 C 54 3 



