4 It is necessary that external heirs should have testamentary capacity, whether it is an independent person, or some one in his power, who is instituted: and this capacity is required at two times; at the same time of the making of the will, when, without it, the institution would be void; and at the same time of the testator's decease, when, without it, the institution would have no effect. Moreover, the instituted heir ought to have this capacity also at the time when he accepts the inheritance, whether he is instituted absolutely or subject to a condition; and indeed it is especially at this time that his capacity to take ought to be looked to. If, however, the instituted heir undergoes a loss of status in the interval between the making of the will and the testator's decease, or the satisfaction of the condition subject to which he was instituted, he is not thereby prejudiced: for, as we said, there are only three points of time which have to be regarded. Testamentary capacity thus does not mean merely capacity to make a will; it also means capacity to take for oneself, or for the father or master in whose power one is, under the will of another person: and this latter kind of testamentary capacity is quite independent of the capacity to make a will oneself. Accordingly, even lunatics, deaf persons, afterborn children, infants, children in power, and other persons' slaves are said to have testamentary capacity; for though they cannot make a valid will, they can acquire for themselves or for another under a will made by someone else. 5 External heirs have the privilege of deliberating whether they will accept or disclaim an inheritance. But if a person who is entitled to disclaim interferes with the inheritance, or if one who has the privilege of deliberation accepts it, he no longer has the power of relinquishing it, unless he is a minor under the age of twentyfive years, for minors obtain relief from the praetor when they incautiously accept a disadvantageous inheritance, as well as when they take any other injudicious step.