70 PRACTICAL TROUT CULTURE. 



of the arrows, and may either enter with a fall over 

 the top of the box, as seen in Fig. 14, or the top of 

 the box may be cut down until the water will enter 

 on the level at which it is intended to stand over 

 the screens. 



F (Fig. 14) is a screen intended to prevent the fish 

 from running beyond the race, or getting into the 

 lower part of the box. It may extend to the bot- 

 tom, or be arranged as seen in the engraving. D 

 is a screen at the front of the box, also intended to 

 prevent the fish from getting below. When the 

 eggs are to be taken this screen is raised on hinges 

 to an upright position, and confined by a spring 

 catch or latch, as seen in E (Fig. 15). This con- 

 fines the fish which may happen to be in the race, 

 and none of them can get below. The pan is then 

 lowered to its position, the roller turned, and the 

 eggs taken. When the operation is finished, the 

 screen (D) is again lowered, the button turned, and 

 the work is done. If- the box is wide, say four 

 feet, it is more convenient to have the pan made in 

 two or three sections, inserted in a light frame, as 

 the eggs can be more easily carried in and poured 

 out of a shorter pan. It is better, perhaps, to 

 make the screen (D) to open in the middle, having 

 hinges at both sides. Then one half will keep the 

 fish in the pond, and the other half the fish in the 

 race, from running into the well. The box can be 



