THREE:Gravity, or "overshot" wheels, as they are called, for some reasons will seem to be the most effective, and capable of utilising the whole effect due to the gravity of the water; but in practice this is not the case, and it is only under peculiar conditions that wheels of this class are preferable to turbine wheels, and in no case will they give out a greater per cent. of power than turbine wheels of the best class. The reasons for this will be apparent by examining the conditions of their operation.The idea of virtue as a hedonistic calculus, abandoned by its first originator, and apparently neglected by his immediate successors, was taken up by Epicurus; for that the latter borrowed it from Plato seems to be proved by the exact62 resemblance of their language;125 and M. Guyau is quite mistaken when he represents his hero as the founder of utilitarian morality.126 It was not enough, however, to appropriate the cast-off ideas of Plato; it was necessary to meet the arguments by which Plato had been led to think that pleasure was not the supreme good, and to doubt whether it was, as such, a good at all. The most natural course would have been to begin by exhibiting the hedonistic ideal in a more favourable light. Sensual gratifications, from their remarkable intensity, had long been the accepted types of pleasurable feeling, and from their animal character, as well as from other obvious reasons, had frequently been used to excite a prejudice against it. On the other hand, Plato himself, and Aristotle still more, had brought into prominence the superiority, simply as pleasures, of those intellectual activities which they considered to be, even apart from all pleasure, the highest good. But Epicurus refused to avail himself of this opportunity for effecting a compromise with the opposite school, boldly declaring that he for his part could not conceive any pleasures apart from those received through the five senses, among which he, characteristically enough, included aesthetic enjoyments. The obvious significance of his words has been explained away, and they have been asserted to contain only the very harmless proposition that our animal nature is the basis, the condition, of our spiritual nature.127 But, if this were the true explanation, it would be possible to point out what other pleasures were recognised by Epicurus. These, if they existed at all, must have belonged to the mind as such. Now, we have it on Cicero��s authority that, while admitting the existence of mental feelings, both pleasurable and painful, he reduced them to an extension and reflection of bodily feelings, mental happiness properly consisting in the assurance of63 prolonged and painless sensual gratification. This is something very different from saying that the highest spiritual enjoyments are conditioned by the healthy activity of the bodily organs, or that they cannot be appreciated if the animal appetites are starved. It amounts to saying that there are no specific and positive pleasures apart from the five senses as exercised either in reality or in imagination.128 And even without the evidence of Cicero, we can see that some such conclusion necessarily followed from the principles elsewhere laid down by Epicurus. To a Greek, the mental pleasures, par excellence, were those derived from friendship and from intellectual activity. But our philosopher, while warmly panegyrising friendship, recommends it not for the direct pleasure which it affords, but for the pain and danger which it prevents;129 while his restriction of scientific studies to the office of dispelling superstitious fears seems meant for a direct protest against Aristotle��s opinion, that the highest pleasure is derived from those studies. Equally significant is his outspoken contempt for literary culture.130 In this respect, he offers a marked contrast to Aristippus, who, when asked by some one what good his son would get by education, answered, ��This much, at least, that when he is at the play he will not sit like a stone upon a stone,��131 the customary attitude, it would seem, of an ordinary Athenian auditor.

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