The Stable- Yard and its Occupants. 29 



and quantity of liquid and solid matters committed to it to 

 maintain a constant and uninterrupted motion, so that stag- 

 nation shall never occur. Secondly, that the entire length 

 of the drain is to be constructed and maintained in a 

 condition of complete impermeability, so that no portion of 

 the matters put into it shall accidentally escape from it. 

 Thirdly, that the head of the drain shall be so efficiently 

 trapped that no gaseous or volatile properties or products 

 can possibly arise from its contents. And, fourthly, that 

 the low extremity of the drain or point of communication 

 with the cesspool shall be so completely and durably 

 formed, that no interruption to the flow of the drainage or 

 escape shall there take place, and that no facility shall be 

 offered for the upward progress of the sewage in case of 

 the cesspool becoming surcharged. 



For most purposes a fall of 2| inches in 10 feet will be 

 sufficient, and the drain should be of 3-inch glazed stone- 

 ware pipes (4 inches for w.c.), with carefully-made socket- 

 joints laid in the direction of the current, and cemented. 

 For the head of the drain we would recommend the bell- 

 trapped horse-pots, which are to be had at all stable fur- 

 nishing ironmongers, taking care that they are sufficiently 

 large and of good strong quality. 



The cesspool for sewage should be well away from the 

 tank provided for the reception of the rain-water, and well 



