The present researches investigate the discipline of «meliorationes, quae graeco vocabulo emponemata dicuntur» in the context of Justinian private emphyteusis, arriving, following the reconstruction of the notion of «emponemata», at an interpretation of C. 4.66.3 (a. 530) according to which this constitution would not imply – also because of the textual comparison with Nov. 64 (a. 538), on the subject of «misthosis» – a derogation from the principle «superficies solo cedit» and – with reference to the case of their alienation – would make conditional and metonymic use of the term «meliorationes» aimed at enucleating – within the sphere of the different possibilities of transfer «inter vivos» of emphyteusis – the case (subject to special regulation) of the «venditio» for the sole hypothesis in which «meliorationes» – that could be qualified as «emponemata» – had intervened on the emphyteutic fund.