DISPOSAL OF EXCEETA 377 



being conveyed by underground pipes direct to the liquid 

 manure tank, while the more solid portion of the fseces are 

 removed by hand to the midden. 



As previously described there would be no difficulty in 

 having surface drains leading to the manure tank and so 

 getting rid of pipes, but the system would probably be 

 objected to. 



In speaking of straw yards (p. 344) it will be remembered 

 that the bottom of the latter is arranged to admit of the 

 percolation of urine, which flows out through an opening 

 specially constructed ; this opening should be in communi- 

 cation with the liquid manure tank by means of a pipe. 



The usual system of draining stables, cow-sheds, and 

 piggeries into the straw yard is a filthy and insanitary pro- 

 ceeding ; it should receive nothing but the urine and fseces 

 deposited there by the animals living in it. One great 

 advantage of a covered yard from the point of view of 

 drainage, is the saving effected in not having to carry off 

 the rain water from the yard, and from the farmer's stand- 

 point this must also be advantageous in not having the 

 soluble portions of a valuable manure washed away. 



The liquid manure tank should not be called upon to 

 receive rain water, if this is not saved from the. buildings 

 by properly constructed tanks, it should form a separate 

 system of drainage and be passed on to the land. On the 

 other hand the excreta from the occupants of the farm, but 

 not their slop water, may be connected with the liquid 

 manure tank. 



The manurial value of slop and waste water is too low to 

 burden the liquid manure tank with it. It should be 

 disposed of on the land, or by pipes laid beneath it so as to 

 be got rid of by subsoil filtration. 



The liquid manure tank and midden, or manure heap, 

 are generally placed side by side. The latter should always 

 be placed on an impermeable floor of concrete, with dwarf 

 walls cemented within, and openings at intervals to allow 

 of carts being filled. It is sound economy to place a roofing 

 over the manure heap, it saves the material from rain, and 



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