But the experience of unnatural parents recommended some limitations of their testamentary powers. A son, or, by the laws of Justinian, even a daughter, could no longer be disinherited by their silence: they were compelled to name the criminal, and to specify the offence; and the justice of the emperor enumerated the sole causes that could justify such a violation of the first principles of nature and society. Unless a legitimate portion, a fourth part, had been reserved for the children, they were entitled to institute an action or complaint of _inofficious_ testament; to suppose that their father's understanding was impaired by sickness or age; and respectfully to appeal from his rigorous sentence to the deliberate wisdom of the magistrate. In the Roman jurisprudence, an essential distinction was admitted between the inheritance and the legacies. The heirs who succeeded to the entire unity, or to any of the twelve fractions of the substance of the testator, represented his civil and religious character, asserted his rights, fulfilled his obligations, and discharged the gifts of friendship or liberality, which his last will had bequeathed under the name of legacies. But as the imprudence or prodigality of a dying man might exhaust the inheritance, and leave only risk and labor to his successor, he was empowered to retain the _Falcidian_ portion; to deduct, before the payment of the legacies, a clear fourth for his own emolument. A reasonable time was allowed to examine the proportion between the debts and the estate, to decide whether he should accept or refuse the testament; and if he used the benefit of an inventory, the demands of the creditors could not exceed the valuation of the effects. The last will of a citizen might be altered during his life, or rescinded after his death: the persons whom he named might die before him, or reject the inheritance, or be exposed to some legal disqualification. In the contemplation of these events, he was permitted to substitute second and third heirs, to replace each other according to the order of the testament; and the incapacity of a madman or an infant to bequeath his property might be supplied by a similar substitution. But the power of the testator expired with the acceptance of the testament: each Roman of mature age and discretion acquired the absolute dominion of his inheritance, and the simplicity of the civil law was never clouded by the long and intricate entails which confine the happiness and freedom of unborn generations.