In later times again, Pythagoras, that celebrated philosopher, was the first to write a treatise on the properties of plants, a work in which he attributes the origin and discovery of them to Apollo, Æsculapius, and the immortal gods in general. Democritus too, composed a similar work. Both of these philosophers had visited the magicians of Persia, Arabia, Æthiopia, and Egypt, and so astounded were the ancients at their recitals, as to learn to make assertions which transcend all belief. Xanthus, the author of some historical works, tells us, in the first of them, that a young dragon[528] was restored to life by its parent through the agency of a plant to which he gives the name of “ballis,” and that one Tylon, who had been killed by a dragon, was restored to life and health by similar means. Juba too assures us that in Arabia a man was resuscitated by the agency of a certain plant. Democritus has asserted—and Theophrastus believes it—that there is a certain herb in existence, which, upon being carried thither by a bird, the name of which we have already[529] given, has the effect, by the contact solely, of instantaneously drawing a wedge from a tree, when driven home by the shepherds into the wood. These marvels, incredible as they are, excite our admiration nevertheless, and extort from us the admission that, making all due allowance, there is much in them that is based on truth. Hence it is too that I find it the opinion of most writers, that there is nothing which cannot be effected by the agency of plants, but that the properties of by far the greater part of them remain as yet unknown. In the number of these was Herophilus, a celebrated physician, a saying of whose is reported, to the effect that some plants may possibly exercise a beneficial influence, if only trodden under foot. Be this as it may, it has been remarked more than once, that wounds and maladies are sometimes inflamed[530] upon the sudden approach of persons who have been journeying on foot. CHAP. 6.—WHY A FEW OF THE PLANTS ONLY HAVE BEEN USED MEDICINALLY. PLANTS, THE MEDICINAL PROPERTIES OF WHICH HAVE BEEN MIRACULOUSLY DISCOVERED. THE CYNORRHODOS: TWO REMEDIES. THE PLANT CALLED DRACUNCULUS: ONE REMEDY. THE BRITANNICA: FIVE REMEDIES.