300 BUILDINGS, SANITATION, AND DISEASES 
walls are lined with matehed lumber, so as to form a dead air 
space inside the wall. 
Floors.—The floors are of coment. Cement Hoors 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 hy painting the first coat of cement with 
hot tar before the surface coat is laid. .\ 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 + 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-ineh tiles. placed 
under the cement to the main tile under the feed passage. The 
opening into these drains is fittel with a perforated iron plate 
set flush with the surface of the cement, under which there is 
ascereen. These perforated plates are easily removed so that the 
serecu can be kept clear, ; 
A. 6-1nch tile from the cateh-basin carries the drainage water 
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 eciling is 8 fect high. Over the feed 
