[IULIANUS libro uicesimo quarto digestorum. ] §28.6.25.prSi pater inpuberes filios inuicem substituerit et ei, qui nouissimus mortuus fuerit, Titium, respondendum est solos fratres bonorum possessionem accepturos et quodammodo duos gradus huius institutionis factos, ut primo fratres inuicem substituerentur, si illi non essent, tunc Titius uocaretur.
[JULIANUS, Book 24 of Digests.] If a father has substituted his impuberate sons mutually for one another, and Titius for the one who dies last, it must be answered that the brothers alone will receive the possession of goods, and that in a certain sense two degrees of this institution have been made, so that first the brothers are substituted mutually for one another, and if they do not exist, then Titius is called.