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THREE:And so, with the dissolution of our bodily organism, the music of consciousness would pass away for ever. Perhaps no form of psychology taught in the Greek schools has approached nearer to modern thought than this. It was professed at Thebes by two Pythagoreans, Cebes and Simmias, in the time of Plato. He rightly regarded them as formidable opponents, for they were ready to grant whatever he claimed for the soul in the way of immateriality and superiority to the body, while denying the possibility of its separate existence. We may so far anticipate the course of our exposition as to mention that the direct argument by which he met them was a reference to the moving power of mind, and to the constraint exercised by reason over passionate impulse; characteristics which the analogy with a musical harmony failed to explain. But his chief reliance was on an order of considerations, the historical genesis of which we shall now proceed to trace.For a half century past no considerable change has been made in engine lathes, at least no new principle of operation has been added, but many improvements have been made in their adaptation and capacity for special kinds of work. Improvements have been made in the facilities for changing wheels in screw cutting and feeding, by frictional starting gear for the carriages, an independent feed movement for turning, arrangements to adjust tools, cross feeding and so on, adding something, no doubt, to the efficiency of lathes; but the improvements named have been mainly directed to supplanting the skill of lathemen.