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CHAP. IX. Nature," it seemed to be implied that the Consensual Contracts were the type of the agreements most congenial to the natural state; and hence arose the singular belief that the younger the civilisation, the simpler must be its forms of contract.

The Consensual Contracts, it will be observed, were extremely limited in number. But it cannot be doubted that they constituted the stage in the history of Contract-law from which all modern conceptions of contract took their start. The motion of the will which constitutes agreement was now completely insulated, and became the subject of separate contemplation; forms were entirely eliminated from the notion of contract, and external acts were only regarded as symbols of the internal act of volition. The Consensual Contracts had, moreover, been classed in the Jus Gentium, and it was not long before this classification drew with it the inference that they were the species of agreement which represented the engagements approved of by Nature and included in her code. This point once reached, we are prepared for several celebrated doctrines and distinctions of the Roman lawyers. One of them is the distinction between Natural and Civil Obligations. When a person of full intellectual maturity had deliberately bound himself by an engagement, he was said to be under a natural obligation, even though he had omitted some necessary formality, and even though