And so also the corruptions of the air are plain to everyone, for it is the nature of the atmosphere to become sick and to decay, and, as one may say, in a manner to die; since what else is it which a man, who is not aiming at selecting plausible language, but only at truth, would call a plague except a death of the atmosphere, which diffuses its own disease and suffering to the destruction of everything which is endowed with life?
 And why need I speak at great length concerning fire? for if it is deprived of nourishment it is immediately extinguished, becoming, as the poets say, tame by its own natural qualities, on which account it depends upon, and is raised up by the duration of the fuel which is supplied and kindled, but when that is expended the fire also disappears. And they say that the dragons in India are exposed to the same kind of fate, for that they crawl upon the greatest of all beasts, namely elephants, and creep over their backs and the whole of their bellies, and then, if they can find a vein, they divide that and
 
drink the blood, sucking it insatiably, with a strong breath and a vigorous noise. Meantime the elephants, though greatly drained, and though becoming gradually exhausted, hold out for some time, leaping about in their perplexity, and lashing their sides with their trunks in the hope of being able to shake off the dragons. After a time, as the vital principle is continually becoming more and more exhausted, they are no longer able to leap about, but stand trembling and quivering, and after a little more time their legs become too weak to support them, and they are thrown down and die for want of blood. And when they are fallen down those animals which were the causes of their death die with them in the following manner: since the dragons have no longer any nourishment, they attempt to loosen the bonds with which they twined themselves round the elephants, wishing now to get released from them, but they are pressed down by the weight of the elephants and crushed, and much more so when the animal has become a lifeless, hard, and stone-like substance; for though they wriggle about and try every expedient in order to effect their release from the power of the animal which weighs them down, and by which they are entangled, though they have long practised themselves in every variety of wile, amid all kinds of difficulties and distresses, they at last become too weak to resist, like men who have been starved to death, or who have been caught by a wall which has suddenly fallen down upon them, and not being able even to lift up their heads they die of suffocation.
If then, each of the separate parts of the world awaits utter destruction, it is plain that the world which is compounded of these can not be itself exempt from destruction.
 We must now consider with accuracy the fourth and remaining argument. Thus they argue: if the world were eternal then the animals also would be eternal, and much more the human race, in proportion as that is more excellent than the other animals; but, on the contrary, those who take delight in investigating the mysteries of nature consider that man has only been created in the late ages of the world; for it is likely, or I should rather say it is inevitably true, that the arts co-exist with man, so as to be exactly co-eval with him, not only because methodical proceedings are appropriate to a rational nature, but also because it is not possible to live without them;