not stop before some level surface receives it, so, too, the nature of existing objects, set in motion by one command, passes through creation, without change, by generation and destruction, preserving the succession of the species through resemblance, until it reaches the very end. It begets a horse as the successor of a horse, a lion of a lion, and an eagle of an eagle; and it continues to preserve each of the animals by uninterrupted successions until the consummation of the universe. No length