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THREE:Again, whatever harmony evolution may introduce into our conceptions, whatever hopes it may encourage with regard to the future of our race, one does not see precisely what sanction it gives to morality at present��that is to say, how it makes self-sacrifice easier than before. Because certain forces have been unconsciously working towards a certain end through ages past, why should I consciously work towards the same end? If the perfection of humanity is predetermined, my conduct cannot prevent its consummation; if it in any way depends on me, the question returns, why should my particular interests be sacrificed to it? The man who does not already love his contemporaries whom he has seen is unlikely to love them the more for the sake of a remote posterity whom he will never see at all. Finally, it must be remembered that evolution is only half the cosmic process; it is partially conditioned at every stage by dissolution, to which in the long run it must entirely give way; and if, as Mr. Spencer observes, evolution is the more interesting of the two,105 this preference is itself due to the lifeward tendency of our thoughts; in other words, to those moral sentiments which it is sought to base on what, abstractedly considered, has all along been a creation of their own.We are here in presence of a phenomenon like that to which attention was invited in an early chapter of this work.371 The belief in immortality, entertained under a gloomy and repulsive form by the uneducated, is taken up by the higher classes, brought into contact with their more generous ideas, broadened, deepened, purified, and finally made the basis of a new religion. Nevertheless, in the present instance at least, all was not clear gain; and the faith which smiles on us from storied sarcophagus and mural relief, or pleads for our sympathy in epitaphs more enduring than the hope which240 they enshrine, had also its grotesque and hideous side, for an expression of which we must turn to literature again.

THREE:The prevailing custom of casting machine frames in one piece, or in as few pieces as possible, leads to a great deal of bar-boring, most of which can be performed accurately enough by boring bars supported in and fed through bearings. By setting up temporary bearings to support boring-bars, and improvising means of driving and feeding, most of the boring on machine frames can be performed on floors or sole plates and independent of boring machines and lathes. There are but few cases in which the importance of studying the principles of tool action is more clearly demonstrated than in this matter of boring; even long practical experience seldom leads to a thorough understanding of the [139] various problems which it involves.