LESSON XVIII.
The same subject, concluded.
Daughter. Well, mother, I understand, now, how the match is set on fire. It is rubbed on the sand-paper, and that produces heat, and the heat sets the match on fire. But I always thought that fire makes heat, and not that heat makes fire.
Mother. Heat does not always make fire, Caroline; for, if it did, everything would be on fire.
Daughter. Everything on fire, mother! why, what do you mean?
Mother. I mean, my dear, that everything contains heat.
Daughter. Everything contains heat, mother, did you say? Why, then, is not everything warm? Some things, mother, are very cold; as ice, and snow, and that marble slab.
Mother. Yes, my child, everything contains heat, as I shall presently show you. When Alice goes to make a fire in a cold day, she does not carry the heat with her, and put it into the fire, nor into the wood, nor the coal, does she?
Daughter. Why, no, to be sure not, mother.