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Note to 
LESSON FORTY-TWO 
MEANING OF DISEASE 
. Sickness. 
. Disease both general and local. 
Common causes of disease. 
. Heredity plays a part. 
. Germs and parasites. 
Immunity by inoculation. 
Some animals resistant to disease. 
Course of disease. 
How disease runs. 
Period of incubation. 
. Period of eruption. 
. Patient improves. 
. Getting well. 
. Learn to recognize disease. 
Avoiding danger. 
the Teacher.—The obvious purpose of this 
lesson is to show the nature of physical disturbances of 
the body, their meaning and nature. Impress strongly 
the fact that the greatest mischief in handling farm stock 
comes from improper food, filthy or impure drinking 
water, bad air in stables, overwork, lack of exercise and 
poor sanitation of the quarters in which the animals are 
housed. If close attention is given these things, there 
will be few disease outbreaks. 
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