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And, in general, water is so far from being selfsufficient for the preservation or generation of other things that the want of fire is water’s destruction. For heat maintains everything in its proper being and keeps it in its proper substance, water itself as well as everything else. When fire withdraws and fails, water putrefies: the dearth of heat is the death and destruction of water. It is, of course, marsh waters and such as are stagnant, some too that have drained into depressions with no outlet, that are badThat is, salt, as, for example, the Dead Sea. and finally putrefy Cf. Mor. 1129 d, 725 d; Athenaeus, 46 b-c. because they have very little motion, which preserves everything by stirring up its heat. This is the reason why we commonly say that those waters are living which have most motion and the strongest current; the heat is maintained by their motion. How, then, should that not be the more useful of two things which has provided what is necessary for the other’s existence, as fire does for water? And surely that is the more useful, the lack of which, if it be entirely taken away, causes the living creature to die. For it is obvious that anything without which a creature cannot live must have been a necessary cause of its existence, while it did exist. Now even corpses have moisture which does not entirely vanish; otherwise dead bodies would not putrefy, since putrefaction is not a change from dry to moist, but rather a corruption of the moisture in flesh. Death, then, is nothing but the total disappearance of heat and so dead men are extremely cold; if you attack them with a razor-blade, you will blunt the edge of it through excess of cold. In the living creature itself, too, the parts that have the least heat are the least sensitive, like bones and hair and the parts that are a long way from the heart. And, in general, the presence of fire makes a greater differenceOr adopting Schultz’s (Hermes, xlvi. 632) emendation: the difference between living and non-living comes from the presence of fire; but the text is hopelessly corrupt. than that of moisture; for it is not mere moisture that produces plants and fruits, but warm moisture; cold water, of course, is either less productive or not productive at all. Yet if by its own nature water were fruitful, it would always bear fruit by itself b; but on the contrary it is even harmful.
