THREE: We have seen that the true measure of crimes is the injury done to society. This is one of those palpable truths which, however little dependent on quadrants or telescopes for their discovery, and fully within the reach of any ordinary intelligence, are yet, by a marvellous combination of circumstances, only recognised clearly and firmly by some few thinkers, belonging to every nationality and to every age. But Asiatic ideas, and passions clothed with authority and power, have, generally by imperceptible movements, sometimes by violent assaults on the timid credulity of mankind, dissipated those simple notions, which perhaps formed the first philosophy of primitive communities, and to which the enlightenment of this age seems likely to reconduct us, but to do so with that greater sureness, which can be gained from an exact[200] investigation into things, from a thousand unhappy experiences, and from the very obstacles that militate against it.But if the custody of the criminal class has been overrated as a preventive of crime, or regarded as the sole preventive instead of one amongst many, it does not follow that crime on that account must be left to itself. It only follows that we should trust to punishment less and to other agencies more in our war with[104] crime, and that we should seek to check the latter at its source, not in its full stream, by attending to the improvement of the general conditions of life. It is quite certain, for instance, that the spread of education, of which Beccaria wrote in terms of such despair, means the diminution of crime; and as the majority of crimes are committed between the ages of twenty and forty, it may be predicted that from the present year onwards the great Act of 1870 will bear increasing fruit in lowering our criminal statistics. More too may be hoped for from the electric light than from any multiplication of prisons.