THE SPAWNING RACE. 



69 



nailed to the side of the box. A similar strip one 

 inch above supports the larger screens. 



The cross-bars also keep the eggs from being car- 

 ried down by the current. By using two small 

 beveled cog-wheels the front roller can be turned 

 by the handle seen at G. As the roller is turned 

 forward the endless apron moves with it, and the 

 eggs, as they come to the edge of the roller, will 

 fall off. The pan, C (Fig. 15), is placed in front of 

 the roller, and receives the eggs as they fall. The 



E 



FIG. 15. 



box need not be more than two feet deep ; the 

 depth depending upon the size of the rollers, 

 which, in a short race, may be quite small, and 

 the box not more than eighteen inches deep. The 

 box is set directly in the race-way, and intended to 

 fill it completely. The water enters in the direction 



