Having put them to death, he next summoned the priests before him. When they gave him the same account, he said that if a tame god had come to the Egyptians he would know it; and with no more words he bade the priests bring Apis. So they went to fetch and bring him. This Apis, or Epaphus, is a calf born of a cow that can never conceive again. By what the Egyptians say, the cow is made pregnant by a light from heaven, and thereafter gives birth to Apis. The marks of this calf called Apis are these: he is black, and has on his forehead a three-cornered white spot, and the likeness of an eagle on his back; the hairs of the tail are double, and there is a knot under the tongue.