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FORE:By examining automatic hammers it will be found that their valves are connected to the drop by means of links, producing [162] coincident movement of the piston and valve, and that the movement of one is contingent upon and governed by the other. It will also be found that these connections or links are capable of extension, so as to alter the relative position of the piston and valve, thereby regulating the range of the blow, but that the movement of the two is reciprocal or in unison. Reasoning inductively, not discovering or inventing, it may be determined that to secure a stamp blow of a hammer-head, the valve must not open or admit steam beneath the piston until a blow is completed and the hammer has stopped.There must, one would suppose, be some force in the Epicurean philosophy of death, for it has been endorsed by no less a thinker and observer than Shakspeare. To make the great dramatist responsible for every opinion uttered by one or other of his characters would, of course, be absurd; but when we find personages so different in other respects as Claudio, Hamlet, and Macbeth, agreeing in the sentiment that, apart from the prospect of a future judgment, there is nothing to appal us in the thought of death, we cannot avoid the inference that he is here making them the mouthpiece of his own convictions, even, as in Hamlet��s famous soliloquy, at the expense of every dramatic propriety. Nevertheless, the answer of humanity to such sophisms will always be that of Homer��s Achilles, ��μ? δ? μοι θ?νατ?ν γε παρα?δα������Talk me not fair of death!�� A very simple process of reasoning will make this clear. The love of life necessarily involves a constant use of precautions against its loss. The certainty of death means the certainty that these precautions shall one day prove unavailing; the consciousness of its near approach means the consciousness that they have actually failed. In both cases the result must be a sense of baffled or arrested effort, more or less feeble when it is imagined, more or less acute when it it is realised. But this diversion of the conscious energies from their accustomed channel, this turning back of the feelings on themselves, constitutes the essence of all emotion; and where the object of the arrested energies was to avert a danger, it constitutes the emotion of fear. Thus, by an inevitable law, the love of life has for its reverse side the dread of death. Now the love of life is guaranteed by the survival of the fittest; it must last as long as the human race, for91 without it the race could not last at all. If, as Epicurus urged, the supreme desirability of pleasure is proved by its being the universal object of pursuit among all species of animals,177 the supreme hatefulness of death is proved by an analogous experience; and we may be sure that, even if pessimism became the accepted faith, the darkened prospect would lead to no relaxation of our grasp on life. A similar mode of reasoning applies to the sorrow and anguish, mortis comites et funeris atri, from which the benevolent Roman poet would fain relieve us. For, among a social species, the instinct for preserving others is second only to the instinct of self-preservation, and frequently rises superior to it. Accordingly, the loss of those whom we love causes, and must always cause us, a double distress. There is, first, the simple pain due to the eternal loss of their society, a pain of which Lucretius takes no account. And, secondly, there is the arrest of all helpful activity on their behalf, the continual impulse to do something for them, coupled with the chilling consciousness that it is too late, that nothing more can be done. So strong, indeed, is this latter feeling that it often causes the loss of those whose existence was a burden to themselves and others, to be keenly felt, if only the survivors were accustomed, as a matter of duty, to care for them and to struggle against the disease from which they suffered. Philosophy may help to fill up the blanks thus created, by directing our thoughts to objects of perennial interest, and she may legitimately discourage the affectation or the fostering of affliction; but the blanks themselves she cannot explain away, without forfeiting all claim on our allegiance as the ultimate and incorruptible arbitress of truth.