There were other seeds which dropped by the wayside in early law, and which were germs of relations that now might be termed contractual, such as the blood covenant, by which people bound themselves together or made themselves of one substance by drinking the blood or eating the flesh of a newly killed animal. Such was the fiction of family relationship, by which, for instance, the Aedui symbolized their alliance with the Romans.[1] I may notice in this connection that I suspect that the mundium or early German guardianship was the origin of our modern bail, while, as I have said, the surety came from a different source. I mention these only to bring still closer home the struggle for existence between competing ideas and forms to which I have referred. In some instances the vanquished competitor has perished. In some it has put on the livery of its conqueror, and has become in form and external appearance merely a case of covenant or assumpsit.
Another important matter is the way in which the various obligations were made binding after they were recognized. A breach of oath of course brought with it the displeasure of the gods. In other cases, as might be expected, we find hints that liabilities of a more primitive sort were extended to the new candidates for legal recognition. In the Roman law a failure to pay the price of a purchase seems to have suggested the analogy of theft. All over the world slavery for debt is found, and this seems not to have stood on the purely practical considerations which first would occur to us, but upon a notion akin to the noxal surrender of the offending body for a tort. There is a mass of evidence that various early contracts in the systems of law from which our own is descended carried with them the notion of pledging the person of the contracting party,—a notion which we see in its extreme form in the seizure or division of the dead body of the debtor,[2] and which seems to come out in the maxim Debita inhaerent ossibus debitoris.
I am not going to trace the development of every branch of our law in succession, but if we turn to the law of torts we find there, perhaps even more noticeably than in the law of contracts, another evolutionary process which Mr. Herbert Spencer has made familiar to us by the name of Integration. The first stage of torts embraces little if anything beyond those simple acts of violence
