[IDEM libro nono decimo ad Sabinum. ] §36.2.4.prSi 'cum heres morietur' legetur, condicionale legatum est: denique uiuo herede defunctus legatarius ad heredem non transfert.
[THE SAME in the nineteenth book on Sabinus] If a legacy is bequeathed in the terms 'when the heir dies', it is a conditional legacy; consequently, if the legatee dies while the heir is still living, he does not transfer [the right] to his own heir.
si uero 'cum ipse legatarius morietur' legetur ei, certum est legatum ad heredem transmitti.
But if it is bequeathed to him in the terms 'when the legatee himself dies', it is certain that the legacy is transmitted to his heir.