TEOUT-HATCHEKIBS 119 



nailed across the bottom. In this is set a wire 

 screen, 14 or 16 mesh to the inch, to keep small 

 fish from passing through. Two inches below 

 is fastened another set of cleats in which are 

 placed pieces of wood, two inches wide, each to 

 form a dam, and when in use to tighten it. 

 The bottom and sides should be filled with stiff 

 clay. 



The water is carried from the supply-trougH 

 into the hatching-troughs by means of faucets, 

 and a wooden spigot is not dependable. One 

 of the various makes of cast-iron molasses- 

 faucets should be selected and the most costly 

 is the best. It is well to be particular about 

 this, because while the idea is generally ex- 

 ploded that any more than a certain quantity 

 of water will burst the egg or the sac of the 

 fry, it is essential for many other reasons to 

 be able to regulate the flow accurately and 

 without danger of something happening to 

 change the amount which has been set. 



Before being used, the inside of all the 

 troughs should be given a heavy coat of tar, in 

 which a little litharge should be mixed to has- 

 ten the drying; and the outside should be 



