TKOUT-HATCHEEIES 117 



entire length of the one side of the house. 



By three tiers of troughs is meant three sets 

 one below the other, with tN water flowing from 

 the supply-trough into the upper end of the first 

 set, from the lower end of the first set into 

 the upper end of the second set, from the lower 

 end of the second into the upper end of the 

 thirdj and from the lower end of the third into 

 the sewer or drain. By this method the water 

 is used three times before it is discharged 

 from the house, and each gallon of water will 

 be equal to three gallons. In setting the tiers 

 or sets, the upper end of the second should pro- 

 ject a couple of inches under the lower end of 

 the first and the upper end of the third a cou- 

 ple of inches under the lower end of the sec- 

 ond tier. 



It would also be well to set the second tier 

 only about two inches below the lower end of 

 the first tier and to set the third tier about an 

 inch above the floor; then there will be a con- 

 siderable fall from the outlet of the second tier 

 into the third tier, and this will aerate the wa- 

 ter. The troughs should not be set exactly on 

 a level. The lower end ought to be from half 



