[IDEM libro uicensimo septimo ad edictum. ] §13.3.3.prIn hac actione si quaeratur, res quae petita est cuius temporis aestimationem recipiat, uerius est, quod Seruius ait, condemnationis tempus spectandum: si uero desierit esse in rebus humanis, mortis tempus, sed ἐν πλάτει secundum Celsum erit spectandum: non enim debet nouissimum uitae tempus aestimari, ne ad exiguum pretium aestimatio redigatur in seruo forte mortifere uulnerato.
[THE SAME, On the Edict, Book XXVII] In this action, if it is asked of what time the thing claimed should receive its valuation, it is more correct, as Servius says, that the time of condemnation must be looked to; but if it has ceased to exist among human affairs, the time of death, though according to Celsus this must be looked to ἐν πλάτει; for the very last moment of life ought not to be valued, lest the valuation be reduced to a paltry price, as in the case, perhaps, of a mortally wounded slave.
in utroque autem, si post moram deterior res facta sit, Marcellus scribit libro uicensimo habendam aestimationem, quanto deterior res facta sit: et ideo, si quis post moram seruum eluscatum dederit, nec liberari eum: quare ad tempus morae in his erit reducenda aestimatio.
In both cases, however, if the thing has deteriorated after default, Marcellus writes in his twentieth book that an assessment must be made of how much worse the thing has become; and therefore, if anyone after default delivers a slave who has lost an eye, he is not discharged; wherefore in these cases the valuation must be referred back to the time of default.