[GAIUS libro tertio ad legem Iuliam et Papiam. ] §28.6.5.prSi in testamento heredes scripti ita alicui substituti fuerint, ut, si is heres non esset, quisquis sibi heres esset is in parte quoque deficientis esset heres: pro qua parte quisque heres exstitisset, pro ea parte eum in portione quoque deficientis uocari placet neque interesse, iure institutionis quisque ex maiore parte heres factus esset an quod per legem alteram partem alicuius uindicasset.
[GAIUS in the third book on the Lex Iulia et Papia.] If in a will the instituted heirs have been substituted for someone in such a manner that, "if he should not be heir, whoever should be an heir to me, he also should be heir to the share of the one failing": it is held that each is called to the share of the one failing in that same proportion in which each stood as heir, and that it makes no difference whether each was made heir to a larger share by the right of institution, or because he had claimed another's share by law.