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THREE:A gravity wheel must have a diameter equal to the fall of water, or, to use the technical name, the height of the head. The speed at the periphery of the wheel cannot well exceed sixteen feet per second without losing a part of the effect by the wheel anticipating or overrunning the water. This, from the large diameter of the wheels, produces a very slow axial speed, and a train of multiplying gearing becomes necessary in order to reach the speed required in most operations where power is applied. This train of gearing, besides being liable to wear [38]and accident, and costing usually a large amount as an investment, consumes a considerable part of the power by frictional resistance, especially when such gearing consists of tooth wheels. Gravity wheels, from their large size and their necessarily exposed situation, are subject to be frozen up in cold climates; and as the parts are liable to be first wet and then dry, or warm and cold by exposure to the air and the water alternately, the tendency to corrosion if constructed of iron, or to decay if of wood, is much greater than in submerged wheels. Gravity wheels, to realise the highest measure of effect from the water, require a diameter so great that they must drag in the water at the bottom or delivering side, and are for this reason especially affected by back-water, to which all wheels are more or less liable from the reflux of tides or by freshets. These disadvantages are among the most notable pertaining to gravity wheels, and have, with other reasons��such as the inconvenience of construction, greater cost, and so on��driven such wheels out of use by the force of circumstances, rather than by actual tests or theoretical deductions.But Epicurus could only borrow the leading principle of his opponents at the expense of an enormous inconsistency. It was long ago pointed out by the Academicians��and the objection has never been answered��that pleasure and mere painlessness cannot both be the highest good, although the one may be an indispensable condition of the other. To confound the means with the end was, indeed, a common fault of Greek philosophy; and the Stoics also were guilty of it when they defined self-preservation to be the natural object of every creature, and yet attached a higher value to the instruments than to the aims of that activity. In Epicureanism, however, the change of front was more open, and was attempted under the eyes of acute and vigilant enemies. If the total absence of pain involves a pleasurable state of consciousness, we have a right to ask for a definition or description of it, and this, so far as can be made out, our philosopher never pretended to supply. Of course, a modern psychologist can point out that the functions of respiration, circulation, secretion, and absorption are constantly going on, and that, in their normal activity, they give rise to a vast sum of pleasurable consciousness, which far more than makes up in volume for what it wants in acuteness. But, whatever his recent interpreters may say,133 Epicurus nowhere alludes to this diffused feeling of vitality; had he recognised it, his enumeration of the positive sensations, apart from which the good is inconceivable, would have seemed as incomplete to him as it does to us. If, on the other hand, the complete removal of pain introduces us to a state of consciousness, which, without being positively pleasurable, has a positive value of some kind, we ought to be told wherein it differs from the ideals of the spiritualist school;66 while, if it has no positive value at all, we ought equally to be told wherein it differs from the unconsciousness of sleep or of death.

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