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146 ownership was coextensive with a liability to provide for all members of the brotherhood out of the common fund. The difficulty is to throw ourselves out of our habitual associations sufficiently for conceiving the nature of his obligation. It was not a legal duty, for law had not yet penetrated into the precinct of the Family. To call it moral is perhaps to anticipate the ideas belonging to a later stage of mental development; but the expression "moral obligation" is significant enough for our purpose, if we understand by it a duty semi-consciously followed and enforced rather by instinct and habit than by definite sanctions.

The Patria Potestas, in its normal shape, has not been, and, as it seems to me, could not have been, a generally durable institution. The proof of its former universality is therefore incomplete so long as we consider it by itself; but the demonstration may be carried much further by examining other departments of ancient law which depend on it ultimately, but not by a thread of connexion visible in all its parts or to all eyes. Let us turn for example to Kinship, or in other words, to the scale on which the proximity of relatives to each other is calculated in archaic jurisprudence. Here again it will be convenient to employ the Roman terms, Agnatic and Cognatic relationship. Cognatic relationship is simply the inception of kinship familiar to modern ideas; it is the