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THREE:Reaction wheels are employed to a limited extent only, and will soon, no doubt, be extinct as a class of water-wheels. In speaking of reaction wheels, I will select what is called Barker's mill for an example, because of the familiarity with which it is known, although its construction is greatly at variance with modern reaction wheels.In Germany, Neo-Aristotelianism has already lived out the appointed term of all such movements; having, we believe, been brought into fashion by Trendelenburg about forty years ago. Since then, the Aristotelian system in all its branches has been studied with such profound scholarship that any illusions respecting its value for our present needs must, by this time, have been completely dissipated; while the Hegelian dialectic, which it was originally intended to combat, no longer requires a counterbalance, having been entirely driven from German university teaching. Moreover, Lange��s famous History of Materialism has dealt a staggering blow to the reputation of Aristotle, not merely in itself, but relatively to the services of early Greek thought; although280 Lange goes too far into the opposite extreme when exalting Democritus at his expense.170 We have to complain, however, that Zeller and other historians of Greek philosophy start with an invariable prejudice in favour of the later speculators as against the earlier, and especially in favour of Aristotle as against all his predecessors, even Plato included, which leads them to slur over his weak points, and to bring out his excellencies into disproportionate relief.171

THREE:Besides this want or difference of facilities which establishments may afford, there is the farther distinction to be made between an engineering establishment and one that is directed to the manufacture of staple articles. This distinction between engineering-works and manufacturing is quite plain to engineers themselves, but in many cases is not so to those who are to enter as apprentices, nor to their friends who advise them. In every case where engagements are made there should be the fullest possible investigation as to the character of the works, not only to protect the learner, but to guard regular engineering establishments in the advantages to be gained by apprentice labour. A machinist or a manufacturer who employs only the muscular strength and the ordinary faculties of workmen in his operations, can afford to pay an apprentice from the beginning a fair share of his earnings; but an engineering-work that projects original plans, generates designs, and assumes risks based upon skill and special knowledge, is very different from a manufactory. To manufacture is to carry on regular processes for converting material; such processes being constantly the same, or approximately so, and such as do not demand much mechanical knowledge on the part of workmen.

THREE:We trust that the steps of a difficult argument have been made clear by the foregoing analysis; and that the whole process has been shown to hinge on the ambiguous use of such notions as the individual and the community, of which the one is paradoxically construed as a plurality and the other as a unity; justice, which is alternately taken in the sense of control exercised by the worthiest, control of passion in the general interest, control of our passions in the interest of others, and control of the same passions in our own interest; and wisdom or reason, which sometimes means any kind of excellence, sometimes the excellence of a harmonious society, and sometimes the excellence of a well-balanced mind. Thus, out of self-regarding virtue social virtue is elicited, the whole process being ultimately conditioned by that identifying power which was at once the strength and the weakness of Plato��s genius.