ANIMAL HEAT. 89 



Q. Why do we need WARMER CLOTHING by 

 NIGHT than by DAY ? 



A. 1 st Because the night is generally 

 colder than the day. 



2ndly As our respiration is slower, 

 our animal combustion is slower also ; in 

 consequence' of which, our bodies are 

 more cold. 



Q. Why do we PERSPIRE when very HOT ? 



A. The pores of the body are like the 

 safety valves of a steam-engine; when 

 the heat of the body is too great, the 

 combustible gas and grease flow out in 

 perspiration, instead of burning in the 

 blood. 



Q. Why do persons feel LAZY and averse to 

 exercise, when they are HALF-STARVED or ILL-FED ? 



A. Animal food contains great nou- 

 rishment, and produces a desire for active 

 occupations; but when the body is not 

 supplied with strong food, this desire for 

 muscular action ceases, and the person 

 grows slothful. 



Q. Why have persons, who follow HARD OUT- 

 OF-DOORS OCCUPATIONS, more APPETITE than those 

 who are engaged in SEDENTARY pursuits ? 



i 3 



