FISHERIES OF THE UNITED STATES. 23 



Section H.— FISH CTTLTUKE. 



XXXV. — Apparatus and Methods, etc. — Continued. 



List of hatching stations — Continued. 



154. Hatching table, in three parts, showing small sized models 



of the various kinds of hatching apparatus used in 

 the United States, in actual working order, the water 

 to be supplied by means of a gas pumping engine which 

 forces it into closed pipes with a pressure of 15 pounds 

 to the square inch. Stop-cocks are placed at frequent 

 intervals in these pipes and are connected with the 

 hatching apparatus by means of rubber tubing. The 

 apparatus is supplied with natural and artificial eggs 

 to get a better idea of its working. The first compart- 

 ment contains the closed apparatus, the next the trough 

 and other apparatus requiring running water, while 

 the third is arranged as a basin or artificial lake for 

 showing the floating apparatus and other kinds used 

 in open streams. A McDonald fish-way is placed at 

 the end of the trough to conduct the waste water to 

 the tank below, from which it is again carried to the 

 pump. 



155. A plaster cast representing a man in the act of taking 



eggs from an Atlantic salmon in a pan in which they 

 are to be impregnated. By his side are casts of a 

 ripe male and female salmon with the abdominal walls 

 removed to show the ovaries and spermaries in position. 



156. A model of the United States Fish Commission steamer 



Fish Hawk, built by Pusey & Jones, of Wilmington, 

 Delaware. 



157. Sectional model of the United States Fish Commission 



steamer Fish Hawk, on a scale of two inches to the 

 foot, showing the hatching deck properly equipped with 

 fish-hatching apparatus and the arrangement of hatch- 

 ing boxes on the outer side. 



158. Models of several of the most important hatching houses 



in the United States, including the following: 



Model of hatching house built at Druid Hill Park, 

 Baltimore, Maryland, in 1875, under the direction of 

 Maj. T. B. Ferguson, then State Commissioner of Fish- 

 eries. The interior of this model is fitted up with 

 miniature hatching apparatus, showing the arrange- 

 ments for actual work. It contains Ferguson hatch- 

 ing jars, flights of Coste trays, Williamson hatching 

 troughs, Clark hatching troughs, Holton hatching box, 

 Green hatching box, aquaria, and reservoir tank pro- 

 vided with filters and porcelain-lined sinks. 



