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308 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