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THREE:With regard to the propagation of the race, Plato��s methods are avowedly borrowed from those practised by bird-fanciers, horse-trainers, and cattle-breeders. It had long been a Greek custom to compare the people to a flock of sheep and their ruler to a shepherd, phrases which still survive in ecclesiastical parlance. Socrates habitually employed the same simile in his political discussions; and the rhetoricians used it as a justification of the governors who enriched themselves at the expense of those committed to their charge. Plato twisted the argument out of their hands and showed that the shepherd, as such, studies nothing but the good of his sheep. He failed to perceive that the parallel could not be carried out in every detail, and that, quite apart from more elevated considerations, the system which secures a healthy progeny in the one case cannot be transferred to creatures possessing a vastly more complex and delicate organisation. The destruction of sickly and deformed children could only be justified on the hypothesis that none but physical qualities were of any value to the community. Our philosopher forgets his own distinction between soul and body just when he most needed to remember it.It is interesting to observe how, here also, the positive science of the age had a large share in determining its philosophic character. Founded on the discovery of the earth��s true shape, Aristotle��s metaphysics had been overthrown by the discovery of the earth��s motion. And now the claims of Cartesianism to have furnished an exact knowledge of matter and a definition of it whence all the facts of observation could be deduced �� priori, were summarily refuted by the discovery421 of universal gravitation. The Cartesians complained that Newton was bringing back the occult qualities of the Schoolmen; but the tendency of bodies to move towards one another proved as certain as it was inexplicably mysterious. For a time, the study of causes was superseded by the study of laws; and the new method of physical science moved in perfect harmony with the phenomenism of Locke. One most important consequence of this revolution was to place the new Critical philosophy on a footing quite different from that occupied by the ancient sceptics. Both restricted certain knowledge to our own states of consciousness; but it now appeared that this might be done without impeaching the value of accepted scientific conclusions, which was more than the Academic philosophy would have admitted. In other words, granting that we were limited to phenomena, it was shown that science consisted in ascertaining the relations of these phenomena to one another, instead of to a problematic reality lying behind them; while, that such relations existed and were, in fact, part of the phenomena themselves, was what no sceptic could easily deny.