They thus led a life divided between mortality and immortality. […] The animal thus divided was placed before Zeus that he might choose on the part of the gods. […] The old man was Acrisius, and thus Perseus unintentionally fulfilled the prediction. […] Ægeus, jealous of his success, laid an ambush for him, and he was thus treacherously murdered. […] Imitating it, he notched a piece of iron on the edge, and thus invented the saw.