The other theory which has been adverted to is the historical theory of Bentham. This theory which is obscurely (and, it might even be said, timidly) propounded in several parts of Bentham's works is quite distinct from that analysis of the conception of law which he commenced in the "Fragment on Government," and which was more recently completed by Mr. John Austin. The resolution of a law into a command of a particular nature, imposed under special conditions, does not affect to do more than protect us against a difficulty--a most formidable one certainly--of language. The whole question remains open as to the motives of societies in imposing these commands on themselves, as to the connection of these commands with each other, and the nature of their dependence on those which preceded them, and which they have superseded. Bentham suggests the answer that societies modify, and have always modified, their laws according to modifications of their views of general expediency. It is difficult to say that this proposition is false, but it certainly appears to be unfruitful. For that which seems expedient to a society, or rather to the governing part of it, when it alters a rule of law is surely the same thing as the object, whatever it may be, which it has in view when it makes the change. Expediency and the greatest good are nothing more than different names for the impulse which prompts the modification; and when we lay down expediency as the rule of change in law or opinion, all we get by the proposition is the substitution of an express term for a term which is necessarily implied when we say that a change takes place.
There is such wide-spread dissatisfaction with existing theories of jurisprudence, and so general a conviction that they do not really solve the questions they pretend to dispose of, as to justify the suspicion that some line of inquiry necessary to a perfect result has been incompletely followed or altogether omitted by their authors. And indeed there is one remarkable omission with which all these speculations are chargeable, except perhaps those of Montesquieu. They take no account of what law has actually been at epochs remote from the particular period at which they made their appearance. Their originators carefully observed the institutions of their own age and civilisation, and those of other ages and civilisations with which they had some degree of intellectual sympathy, but, when they turned their attention to archaic states of society which exhibited much superficial difference from their own, they uniformly ceased to observe and began guessing. The mistake which they committed is therefore analogous to the error of one who, in investigating the laws of the material universe, should commence by contemplating the existing physical world as a whole, instead of beginning with the particles which are its simplest ingredients. One does not certainly see why such a scientific solecism should be more defensible in jurisprudence than in any other region of thought. It would seem antecedently that we ought to commence with the simplest social forms in a state as near as possible to their rudimentary condition. In other words, if we followed the course usual in such inquiries, we should penetrate as far up as we could in the history of primitive societies. The phenomena which early societies present us with are not easy at first to understand, but the difficulty of grappling with them bears no proportion to the perplexities which beset us in considering the baffling entanglement of modern social organisation. It is a difficulty arising from their strangeness and uncouthness, not from their number and complexity. One does not readily get over the surprise which they occasion when looked at from a modern point of view; but when that is surmounted they are few enough and simple enough. But even if they gave more trouble than they do, no pains would be wasted in ascertaining the germs out of which has assuredly been unfolded every form of moral restraint which controls our actions and shapes our conduct at the present moment.