Thus Augustine denies the existence of Antipodes, men on the opposite side of the earth, who walk with their feet opposite to our own.[79] That did not harmonize with his general conception of Scriptural cosmogony. For the result, one can point to a concrete instance which is typical of much. In patristic circles the knowledge of the animal kingdom came to be represented by the curious book called the _Physiologus_. It was a series of descriptions of animals, probably based on stories current in Alexandria, and appears to have been put together in Greek early in the second century. Internal evidence has led to the supposition that it emanated from Gnostic circles. It soon came into common use among the Greek and Latin Fathers. Origen draws from it by name. In the West, to refer only to the fourth and fifth centuries, Ambrose seems to use it constantly, Jerome occasionally, and also Augustine. Well known as these stories are, one or two examples may be given to recall their character: The Lion has three characteristics; as he walks or runs he brushes his footprints with his tail, so that the hunters may not track him. This signifies the secrecy of the Incarnation--of the Lion of the tribe of Judah. Secondly, the Lion sleeps with his eyes open; so slept the body of Christ upon the Cross, while His Godhead watched at the right hand of the Father. Thirdly, the Lioness brings forth her cub dead; on the third day the father comes and roars in its face, and wakes it to life. This signifies our Lord’s resurrection on the third day. The Pelican is distinguished by its love for its young. As these begin to grow they strike at their parents’ faces, and the parents strike back and kill them. Then the parents take pity, and on the third day the mother comes and opens her side and lets the blood flow on the dead young ones, and they become alive again. Thus God cast off mankind after the Fall, and delivered them over to death; but He took pity on us, as a mother, for by the Crucifixion He awoke us with His blood to eternal life. The _Unicorn_ cannot be taken by hunters, because of his great strength, but lets himself be captured by a pure virgin. So Christ, mightier than the heavenly powers, took on humanity in a virgin’s womb. The Phoenix lives in India, and when five hundred years old fills his wings with fragrant herbs and flies to Heliopolis, where he commits himself to the flames in the Temple of the Sun. From his ashes comes a worm, which the second day becomes a fledgling, and on the third a full-grown phoenix, who flies away to his old dwelling-place. The Phoenix is the symbol of Christ; the two wings filled with sweet-smelling herbs are the Old and New Testaments, full of divine teaching.[80]