320 BUILDINGS, SANITATION, AND DISEASES 
removed, and all adhering filth scraped off the floors, par- 
titions, and troughs. It is of little use applying a disinfectant 
on top of a coating of filth which may conceal and protect 
millions of disease germs. A good spray pump is best for 
applying the disinfectant, so as to force the liquid into every 
erack and cranny, and it is not wise to be economical in the 
use of the disinfectant. Every part of the pen should be 
thoroughly saturated with the solution. 
If there are small outside yards attached to the piggery, 
they should be floored with concrete, and then they can be dis- 
infected in the same way as the interior of the building. If 
they are not floored it is almost impossible to disinfect them 
thoroughly, and they are a constant menace to the health of 
the animals, 
Pasture lots and large paddocks or feed lots are more 
difficult to deal with. Liberal liming and plowing up is about 
all that can he done. In case of some diseases, such as cholera, 
it is safer to remove the hogs to other feed lots or pastures for 
at least several months. Of course, the lots could be disinfected 
by saturating the surface soil with a good disinfectant, but it 
would be an expensive operation. (Fig. 86.) 
Systematic disinfection of the premises should not be neg- 
lected even if there is no disease. A small spray pump and a 
constant supply of disinfectant to be used at frequent intervals 
about. the buildings constitute an important part of the equip- 
ment of a piggery. At least once a year, a general house- 
cleaning is advisable, and whitewashing the walls, ceiling, and 
partitions with lime and erude carbolic acid will go a long 
way towards keeping the building sanitary. A good pint of 
crude carbolic acid to three gallons of whitewash will answer 
the purpose. 
