Cf. Trin. vii. 28, x. 15, 16. Similarly in the Eumenides 637, Æschylus makes Apollo excuse Orestes’ murder of Clytænnestra on the ground that the mother is not the parent, but only the nurse of the germ. This is contrary to Aristotle’s teaching; Æschylus and Hilary evidently represent a rival current of ancient opinion.