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314 but most distinctly, the mental engagement isolates itself amid the technicalities, and gradually becomes the sole ingredient on which the interest of the jurisconsult is concentrated. Such a mental engagement, signified through external acts, the Romans called a Pact or Convention; and when the Convention has once been conceived as the nucleus of a Contract, it soon becomes the tendency of advancing jurisprudence to break away the external shell of form and ceremony. Forms are thenceforward only retained so far as they are guarantees of authenticity, and securities for caution and deliberation. The idea of a Contract is fully developed, or, to employ the Roman phrase, Contracts are absorbed in Pacts.

The history of this course of change in Roman law is exceedingly instructive. At the earliest dawn of the jurisprudence, the term in use for a Contract was one which is very familiar to the students of historical Latinity. It was nexum, and the parties to the contract were said to be nexi, expressions which must be carefully attended to on account of the singular durableness of the metaphor on which they are founded. The notion that persons under a contractual engagement are connected together by a strong bond or chain, continued till the last to influence the Roman jurisprudence of Contract; and flowing thence it has mixed itself with modern ideas. What then was involved in this nexum or bond? A definition