Trout Breeding. 



45 



sized gate, which when shut entirely down causes water 

 not used in the troughs to flow over the upper dam into 

 the ponds. 



4. Discharging in a central ditch under the floor. 



5. Cheapness in construction and lasting a hundred 

 times as long as wooden distributing troughs. 



At the Long Island station I ran the waste water back 

 under the hatching troughs in four-inch soil pipes to a 

 waste trough outside the building (see frontispiece), 

 because the ground under the hatchery is lower than 



IMPROVED WATER SUPPLY. A, six- 

 inch pipe under building in ditch ; B, 

 lower end of pipe ; C, gate to free pipe 

 from sediment ; DD, waste pipes from 

 troughs ; ' EE, floor of hatchery ; F, 

 two-inch pipe to supply two troughs 



on each side of the house; GG, brass gates, i 1-4 inch, which 



is plenty, with a lo-foot head. 



the ponds outside, but at Bath the case is different and 

 the arrangement shown is the best for the situation, and 

 as it is a different mode of supply from any in use as 

 far as I know, it seems worthy of illustration. 



The main pipe was to be pierced for nine two-inch 

 uprights with "tees" to branch to each side, under the 

 floor: these will bend up and over the troughs, ending 

 in a "tee" with two branches and gates, which, with a 

 head of several feet, will give the required flow, 



