Again, let us consider the wonders of lime; for besides growing white in fire, which makes other things black, and of which I have already said enough, it has also a mysterious property of conceiving fire within it. Itself cold to the touch, it yet has a hidden store of fire, which is not at once apparent to our senses, but which experience teaches us, lies as it were slumbering within it even while unseen. And it is for this reason called "quick lime," as if the fire were the invisible soul quickening the visible substance or body. But the marvellous thing is, that this fire is kindled when it is extinguished. For to disengage the hidden fire the lime is moistened or drenched with water, and then, though it be cold before, it becomes hot by that very application which cools what is hot. As if the fire were departing from the lime and breathing its last, it no longer lies hid, but appears; and then the lime lying in the coldness of death cannot be requickened, and what we before called "quick," we now call "slaked." What can be stranger than this? Yet there is a greater marvel still. For if you treat the lime, not with water, but with oil, which is as fuel to fire, no amount of oil will heat it. Now if this marvel had been told us of some Indian mineral which we had no opportunity of experimenting upon, we should either have forthwith pronounced it a falsehood, or certainly should have been greatly astonished. But things that daily present themselves to our own observation we despise, not because they are really less marvellous, but because they are common; so that even some products of India itself, remote as it is from ourselves, cease to excite our admiration as soon as we can admire them at our leisure.