For it is of course no rare event to meet with marvels, if that is what one's mind is set on. He may marvel at what he finds immediately at hand,—for instance, why the lamp gives light owing to its having a bright flame, while a bronze mirror, likewise bright, does not produce light but instead reflects other things that appear in it; or how it comes about that olive oil, though wet, makes the flame higher, while water, because it is wet, puts the fire out.
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