300 BUILDINGS, SANITATION, AND DISEASES 



walls are lined with matched lumber, so as to form a dead air 

 space inside the wall. 



Floors. The floors are of cement. Cement floors are open 

 to certain objections, but they are durable and sanitary and they 

 must be considered as the most satisfactory floor known at the 

 present time. 



It might be noted here that a piggery floor may be kept free 

 from ascending moisture by painting the first coat of cement with 

 hot tar before the surface coat is laid. A floor constructed 

 in this way may not be so' strong as the ordinary cement floor, 

 but the tar is a good insulator, preventing moisture from rising 

 from below and also' making the floor warmer. This arrange- 

 ment is especially desirable under the sleeping quarters of the 

 pigs, especially when a plank overlay is not used. 



Drainage. The dotted lines shown in, the plan indicate 

 the method of drainage. A 6-inch tile runs under the cement 

 of the feed passage to a catch-basin about, the centre of the build- 

 ing. The tile is given a fall of 4 inches from each extremity to 

 the catch-basin. 



The floor of each pen falls to a point under the partition, 

 from which point the moisture is carried in 4-inch tiles placed 

 ' under the cement, to the main tile under the feed passage. The 

 opening into these drains is fitted with a perforated iron plate 

 set flush with the surface of the cement, under which there is 

 a screen. These perforated plates are easily removed so that the 

 screen can be kept clear. 



A 0-inch tile from the catch-basin carries the drainage wate<r 

 outside the building. 



It will be noted that provision is made for draining the sur- 

 face of the passage into the catch-basin for the sake of con- 

 venience! when the passage floor is cleaned. 



Ventilation. The ceiling is 8 feet high. Over the feed 



