SANITATION 325 



apron where the hogs emerge from the tank. By keeping the 

 hogs a short time on this incline after they come out of the 

 tank, a great deal of dip can be saved from waste. (Fig. 88.) 



The tank should contain enough lukewarm water, to which 

 the dip has been added, to thoroughly immerse the hogs, the quan- 

 tity varying with the size of the hogs. If crude oil is used, 12 to 

 15 gallons to a tank of water is sufficient. The hogs should work 

 their way through the dip by their rear legs, with their noses just 

 out of the water. 



When lice have been in a building for some time, it will 

 be necessary to treat the building in practically the same way- 

 as recommended for disinfection, the disinfectants being also 

 good insecticides. 



In treating for lice, one application of insecticides is seldom 

 sufficient, because there will be many eggs to hatch out to give 

 a new brood. A second treatment, about a week after the first, 

 should always be given, and a third treatment would not be 

 out of place. 



Hog Wallows. Hogs suffer from heat, and enjoy wallowing 

 in water or mud. The ordinary wallow becomes very filthy and 

 is a good breeding ground for disease. Cement hog wallows, 

 located in a shady place, and constructed so as to contain eight or 

 ten inches of water, are sanitary and add much to the comfort 

 of the pig in hot summer weather. Crude oil or coal tar dip may 

 be added to the water in the wallow, and thus help to keep down 

 lice, and to promote sanitary conditions. (Fig. 89.) 



REVIEW. 



1. How may cleanliness be secured in a piggery? 



2. Mention several disinfectants and tell how to use them. 



3. Tell of the necessary steps in securing purity of quarters after a 

 disease among the hogs. 



4. Mention methods of purifying yards and pastures. 



