PORK PRODUCTION FOR RURAL SCHOOLS. 
21 
(2) Make a study of the permanent pastures of the community 
with reference to the type or types of soil used, the kind or kinds of 
grass crop, the period of the year during which grazing is afforded, 
the life in years of each kind of permanent pasture, the method of 
planting or seeding, the number of acres in permanent pasture on 
each farm, the total pasture acreage in the community, the percent- 
age of arable land devoted to pasturage, and the average number of 
hogs an acre of pasture supports. 
Correlations. — Tabulating the information called for in Exercise 2 
provides written work and exercises in arithmetic. 
LESSON IX. 
TOPIC: SANITATION AND DISEASES. 
Time. — Spring. 
Lesson outline. — Sanitation: Hogs should be provided with clean, 
dry, well-ventilated quarters. Feeding places should be kept clean 
Fig. 12.— A cement wallow— a desirable type. 
and the water supply pure. Hogs should be allowed access only to 
streams the sources and courses of which are known to be uncon- 
taminated. Wallows (fig. 12) should be kept clean and supplied 
constantly with clean water. The houses and immediate premises 
should be thoroughly disinfected (fig. 13) once a month with air- 
slaked lime or a 5 per cent solution of crude carbolic acid. Animals 
that show indications of sickness should be immediately isolated 
