The definite theories of jurists are scarcely nearer the truth in this point than the opinions of the multitude. To begin with the views of the Roman lawyers, we find them inconsistent with the true history of moral and legal progress. One class of contracts, in which the plighted faith of the contracting parties was the only material ingredient, they specifically denominated Contracts _juris gentium_, and though these contracts were undoubtedly the latest born into the Roman system, the expression employed implies, if a definite meaning be extracted from it, that they were more ancient than certain other forms of engagement treated of in Roman law, in which the neglect of a mere technical formality was as fatal to the obligation as misunderstanding or deceit. But then the antiquity to which they were referred was vague, shadowy, and only capable of being understood through the Present; nor was it until the language of the Roman lawyers became the language of an age which had lost the key to their mode of thought that a "Contract of the Law of Nations" came to be distinctly looked upon as a Contract known to man in a State of Nature. Rousseau adopted both the juridical and the popular error. In the Dissertation on the effects of Art and Science upon Morals, the first of his works which attracted attention and the one in which he states most unreservedly the opinions which made him the founder of a sect, the veracity and good faith attributed to the ancient Persians are repeatedly pointed out as traits of primitive innocence which have been gradually obliterated by civilisation; and at a later period he found a basis for all his speculations in the doctrine of an original Social Contract. The Social Contract or Compact is the most systematic form which has ever been assumed by the error we are discussing. It is a theory which, though nursed into importance by political passions, derived all its sap from the speculations of lawyers. True it certainly is that the famous Englishmen, for whom it had first had attraction, valued it chiefly for its political serviceableness, but, as I shall presently attempt to explain, they would never have arrived at it, if politicians had not long conducted their controversies in legal phraseology. Nor were the English authors of the theory blind to that speculative amplitude which recommended it so strongly to the Frenchmen who inherited it from them. Their writings show they perceived that it could be made to account for all social, quite as well as for all political phenomena. They had observed the fact, already striking in their day, that of the positive rules obeyed by men, the greater part were created by Contract, the lesser by Imperative Law. But they were ignorant or careless of the historical relation of these two constituents of jurisprudence. It was for the purpose, therefore, of gratifying their speculative tastes by attributing all jurisprudence to a uniform source, as much as with the