Most people have seen a sick cat eat grass, or an uneasy dog seek out some weed and devour it greedily to make his complaining stomach feel better. Some few may have read John Wesley's directions on the art of keeping well--which have not, however, found their way into his book of discipline for the soul--and have noted with surprised interest his claim that many medicines in use among the common people and the physicians of his time were discovered by watching the animals that sought out these things to heal their diseases. "If they heal animals they will also heal men," is his invincible argument. Others may have dipped deep into Indian history and folk-lore and learned that many of the herbs used by the American tribes, and especially the cures for rheumatism, dysentery, fever, and snake bites, were learned direct from the animals, by noting the rheumatic old bear grub for fern roots or bathe in the hot mud of a sulphur spring, and by watching with eager eyes what plants the wild creatures ate when bitten by rattlers or wasted by the fever. Still others have been fascinated with the first crude medical knowledge of the Greeks, which came to them from the East undoubtedly, and have read that the guarded mysteries of the Asclepiades, the healing cult that followed Æsculapius, had among them many simple remedies that had first proved their efficacy among animals in a natural state; and that Hippocrates, the greatest physician of antiquity, whose fame under the name of Bokrat the Wise went down through Arabia and into the farthest deserts, owes many of his medical aphorisms to what he himself, or his forebears, must have seen out of doors among the wild creatures. And all these seers and readers have perhaps wondered how much the animals knew, and especially how they came to know it.
[Illustration: "Escaped at last by swimming an icy river"]
To illustrate the matter simply and in our own day and generation: A deer that has been chased all day long by dogs, and that has escaped at last by swimming an icy river and fallen exhausted on the farther shore, will lie down to sleep in the snow. That would mean swift death for any human being. Half the night the deer will move about at short intervals, instead of sleeping heavily, and in the morning he is as good as ever and ready for another run. The same deer shut up in a warm barn to sleep overnight, as has been more than once tested with park animals, will be found dead in the morning.