With such gibes at the term “conception,” he shows, to the best of his ability, that it is useless and unprofitable for the life of man. What, then, was the origin of our higher branches of learning, of geometry, arithmetic, the logical and physical sciences, of the inventions of mechanical art, of the marvels of measuring time by the brazen dial and the water-clock? What, again, of ontology, of the science of ideas, in short of all intellectual speculation as applied to great and sublime objects? What of agriculture, of navigation, and of the other pursuits of human life? how comes the sea to be a highway for man? how are things of the air brought into the service of things of the earth, wild things tamed, objects of terror brought into subjection, animals stronger than ourselves made obedient to the rein? Have not all these benefits to human life been achieved by conception? For, according to my account of it, conception is the method by which we discover things that are unknown, going on to further discoveries by means of what adjoins to and follows from our first perception with regard to the thing studied. For when we have formed some idea of what we seek to know, by adapting what follows to the first result of our discoveries we gradually conduct our inquiry to the end of our proposed research.