Sometimes both Utility and Analogy fail, and leave the Laws of Justice in total Uncertainty. Thus, 'tis highly requisite, that Prescription or long Possession should convey Property; but what Number of Days or Months or Years should be sufficient for that Purpose, 'tis impossible for Reason alone to determine. Civil Laws here supply the Place of the natural Code, and assign different Terms for Prescription, according to the different Utilities, propos'd by the Legislator. Bills of Exchange and promissory Notes, by the Laws of most Countries, prescribe sooner than Bonds and Mortgages, and Contracts of a more formal Nature.
In general we may observe, that all Questions of Property are subordinate to the Authority of civil Laws, which extend, restrain, modify, and alter the Rules of natural Justice, according to the particular Convenience of each Community. The Laws have, or ought to have, a constant Reference to the Constitution of Government, the Manners, the Climate, the Religion, the Commerce, the Situation of each Society. A late Author of great Genius, as well as extensive Learning, has prosecuted this Subject at large, and has establish'd, from these Principles, the best System of political Knowledge, that,perhaps,
