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CHAP. I. usages which a particular community is found to have adopted in its infancy and in its primitive seats are generally those which are on the whole best suited to promote its physical and moral well-being; and, if they are retained in their integrity until new social wants have taught new practices, the upward march of society is almost certain. But unhappily there is a law of development which ever threatens to operate upon unwritten usage. The customs are of course obeyed by multitudes who are incapable of understanding the true ground of their expediency, and who are therefore left inevitably to invent superstitious reasons for their permanence. A process then commences which may be shortly described by saying that usage which is reasonable generates usage which is unreasonable. Analogy, the most valuable of instruments in the maturity of jurisprudence, is the most dangerous of snares in its infancy. Prohibitions and ordinances, originally confined, for good reasons, to a single description of acts, are made to apply to all acts of the same class, because a man menaced with the anger of the gods for doing one thing, feels a natural terror in doing any other thing which is remotely like it. After one kind of food has interdicted for sanitary reasons, the prohibition is extended to all food resembling it, though the resemblance occasionally depends on analogies the most fanciful. So, again, a wise provision for