UTILIZING HOUSE-WASTE. 



69 



flushes the siphon and sets it in operation, and the tank 

 is drained to the level of the shorter leg of the siphon, 

 The contents of the cistern flow away by a pipe, which 

 leads from the drain. This tank is called the " self-act- 

 ing flush tank." The cover is a movable plank floor 

 which serves to allow access to the tank for any purpose. 

 But this leads to the real subject matter in hand, the ir- 

 rigation of the garden with liquid manure. 



By this plan this can be secured whenever it is desired 

 by simply introducing into the tank sufficient water to 

 set the siphon in operation. The liquid than passes into 

 the drain, and from that into subdrains of one-inch drain 

 tiles placed one foot beneath the sur- 

 face, and escapes through the joints of 

 these into the soil. This arrangement is 

 seen in the plan given in the accom- 

 panying illustration, fig. 24. The outer 

 lines represent the boundary of the gar- 

 den plot, supposed to be an eigth of an 

 acre, or 50 x 100 feet. The tank is seen 

 at T ; the dark lines are the irrigating 

 drains ; the square dots are inspection 

 wells, covered with a square stone or 

 plank cover, by which examinations are 

 occasionally made as to the condition of 

 the drains, and the parallel lines between 

 the drains are pipes which carry off any 

 excess of moisture. This plan is capable of very ex- 

 tended application where the land to be irrigated may be 

 beneath the level of the site of the house and the tank, 

 and no house should be built on a lower level than the 

 ground around it. 



An improved tank suitable for dwellings of a some- 

 what superior character is shown in figure 25. The prin- 

 ciple is exactly the same as that previously described, the 

 material of the tank being different. It is cylindrical in 



