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320 obtained recognition as distinct transactions through the important practical consequences of the experiment. There is some, but not very violent, conjecture in the following delineation of the process. Let us conceive a sale for ready money as the normal type of the Nexum. The seller brought the property of which he intended to dispose—a slave, for example—the purchaser attended with the rough ingots of copper which served for money—and an indispensable assistant, the libripens, presented himself with a pair of scales. The slave with certain fixed formalities was handed over to the vendee—the copper was weighed by the libripens and passed to the vendor. So long as the business lasted it was a nexum, and the parties were nexi; but the moment it was completed, the nexum ended, and the vendor and purchaser ceased to bear the name derived from their momentary relation. But now, let us move a step onward in commercial history. Suppose the slave transferred, but the money not paid. In that case, the nexum is finished, so far as the seller is concerned, and when he has once handed over his property, he is no longer nexus; but, in regard to the purchaser, the nexum continues. The transaction, as to his part of it, is incomplete, and he is still considered to be nexus. It follows, therefore, that the same term described the Conveyance by which the right of property was transmitted, and the personal