96 THE MANURE HEAP AND SEWAGE 
presenting itself is precisely the same as that presented to the 
city for disposing of its sewage, and the same means are to be used 
in each case. 
The time is coming, and, in some places, has arrived, when 
it is necessary to find a plan for disposing of the sewage on the 
ordinary farm in some other way than by emptying it into a 
stream. It is very easy for the farm to make use of the principles 
of a septic tank in caring for and even utilizing its sewage. Fig. 18 
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Fic. 18.-~Diagram showing the method of applying the septic tank to a farm house, 
shows diagrammatically a means of accomplishing it efficiently 
and at comparatively small expense. The diluted sewage from 
the house is conducted to a tank sunk in the ground at any con- 
venient distance. The tank should be of such a size that it will 
hold the entire sewage for twenty-four hours. If each person 
uses twenty gallons of water per day, the tank for a household of 
ten should be three feet deep, two feet wide and six feet long. 
It must be covered so as to exclude air and light, and the sewage 
must flow slowly and quietly through the tank, thus making it a 
septic tank. The discharge from the tank is best received into a 
second tank from which it can be conducted to a stream or upon 
the garden for fertilizing and irrigating it. 
