94 CHEMICAL ACTION. 



Q. Why are POOR PEOPLE generally AVERSE 



to VENTILATION ? 



A. 1st Because ventilation increases 

 the oxygen of the air, the combustion of 

 food, and the cravings of appetite : and 



2ndly Ventilation cools the air of our 

 rooms : poor people, therefore, (who are 

 generally ill-clad) love the warmth of an 

 ill-ventilated apartment. 



Q. Why does FLANNEL, Sc. make us WARM ? 



A. Flannel and warm clothing do 

 not make us warm, but merely prevent 

 the body from becoming cold. 



Q. How does flannel, $c. prevent the body from 

 becoming cold ? 



A. Flannel (being a bad conductor) 

 will neither carry off the heat of the body 

 into the cold air, nor suffer the cold of 

 the air to come into contact with our 

 warm bodies ; and thus it is that flannel 

 clothing keeps us warm. 



Q. Why are FROGS and FISHES COLD-BLOODED 

 animals ? 



A. Because they consume so little 

 air; and without a plentiful supply of 

 air, combustion is so slow, that very little 

 animal heat is evolved. 



