2ndly—Dirt is warm, (thus pigs who love warmth, are fond of dirt); and as poor people are generally ill-clad, they like the warmth of dirt.
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, &c. 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?