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24 may further be remarked that no one is likely to succeed in the investigation who does not clearly realise that the stationary condition of the human race is the rule, the progressive the exception. And another indispensable condition of success is an accurate knowledge of Roman law in all its principal stages. The Roman jurisprudence has the longest known history of any set of human institutions. The character of all the changes which it underwent is tolerably well ascertained. From its commencement to its close, it was progressively modified for the better, or for what the author of the modification conceived to be the better, and the course of improvement was continued through periods at which all the rest of human thought and action materially slackened its pace, and repeatedly threatened to settle down into stagnation.

I confine myself in what follows to the progressive societies. With respect to them it may be laid down that social necessities and social opinion are always more or less in advance of Law. We may come indefinitely near to the closing of the gap between them, but it has a perpetual tendency to reopen. Law is stable; the societies we are speaking of are progressive. The greater or less happiness of a people depends on the degree of promptitude with which the gulf is narrowed.

A general proposition of some value may be