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FORE:On Alexander��s departure for the East, Aristotle returned to Athens, where he now placed himself at the head of a new philosophical school. The ensuing period of thirteen years288 was fully occupied by the delivery of public lectures, and by the composition of those encyclopaedic writings which will preserve his memory for ever, along, perhaps, with many others which have not survived. Like Anaxagoras, he was not allowed to end his days in the city of his adoption. His youthful attacks on Isocrates had probably made him many enemies among that rhetor��s pupils. It is supposed by Grote, but warmly disputed by Zeller, that his trenchant criticisms on Plato had excited a similar animosity among the sectaries of the Academy.178 Anyhow, circumstances had unavoidably associated him with the detested Macedonian party, although his position, as a metic, or resident alien, debarred him from taking any active part in politics. With Alexander��s death the storm broke loose. A charge was trumped up against Aristotle, on the strength of his unlucky poem in honour of Hermeias, which was described as an insult to religion. That such an accusation should be chosen is characteristic of Athenian bigotry, even should there be no truth in the story that certain philosophical opinions of his were likewise singled out for prosecution. Before the case came on for trial, Aristotle availed himself of the usual privilege allowed on such occasions, and withdrew to Chalcis, in order, as he said, that the Athenians need not sin a second time against philosophy. But his constitution, naturally a feeble one, was nearly worn out. A year afterwards he succumbed to a stomach complaint, aggravated, if not produced, by incessant mental application. His contemporary, Demosthenes, perished about the same time, and at the same age, sixty-two. Within little more than a twelvemonth the world had lost its three greatest men; and after three centuries of uninterrupted glory, Hellas was left unrepresented by a single individual of commanding genius.As a result of the foregoing criticism, Aristotle distinguishes four different causes or principles by which all things are determined to be what they are��Matter, Form, Agent, and Purpose.226 If, for example, we take a saw, the matter is steel; the form, a toothed blade; the agent or cause of its assuming that shape, a smith; the purpose, to divide wood or stone. When we have enumerated these four principles, we have told everything that can be known about a saw. But Aristotle could not keep the last three separate; he gradually extended the definition of form until it absorbed, or became identified with, agent and purpose.227 It was what we should call the idea of function that facilitated the transition. If the very essence or nature of a saw implies use, activity, movement, how can we define it without telling its purpose? The toothed blade is only intelligible as a cutting, dividing instrument. Again, how came the saw into being? What shaped the steel into that particular form? We have said that it was the smith. But surely that is too vague. The smith is a man, and may be able to exercise other trades as well. Suppose him to be a musician, did he make the saw in that capacity? No; and here comes in a distinction which plays an immense part in Aristotle��s metaphysics, whence it has passed into our every-day speech. He does not make the saw qua musician but qua smith. He can, however, in the exercise of his trade as smith make many other tools��knives, axes, and so forth. Nevertheless, had he only learned to make saws it would be enough. Therefore, he does not make335 the saw qua axe-maker, he makes it qua saw-maker. Nor, again, does he make it with his whole mind and body, but only with just those thoughts and movements required to give the steel that particular shape. Now, what are these thoughts but the idea of a saw present in his mind and passing through his eyes and hands, till it fixes itself on the steel? The immaterial form of a saw creates the real saw which we use. Let us apply the preceding analogies to a natural object; for example, a man. What is the Form, the definition of a man? Not a being possessing a certain outward shape, for then a marble statue would be a man, which it is not; nor yet a certain assemblage of organs, for then a corpse would be a man, which, according to Aristotle, criticising Democritus, it is not; but a living, feeling, and reasoning being, the end of whose existence is to fulfil all the functions involved in this definition. So, also, the creative cause of a man is another man, who directly impresses the human form on the material supplied by the female organism. In the same way, every definite individual aggregate becomes what it is through the agency of another individual representing the same type in its perfect manifestation.228

FORE:Examining machines made by the best designers, it will be found that their dimensions bear but little if any reference to calculated strains, especially in machines involving rapid motion. Accidents destroy constants, and a draughtsman or designer who does not combine special and experimental knowledge with what he may learn from general sources, will find his services to [89]be of but little value in actual practice.