from whom does the reservista inherit?

*. It is likewise clear that the reservable property is no part of the estate of the reservista, who may not dispose of it by will, as long as there are reservatarios existing (Arroyo vs. Gerona, 58 Phil. 237). The latter, therefore, do not inherit from the reservista, but from the descendant prepositus, of whom the reservatarios are the heirs mortis causa, subject to the condition that they must survive the reservista. (Sanchez Roman, Vol. VI, Tomo 2, p. 286; Manresa, Commentaries, Vol. 6, 6th Ed., pp. 274, 310) * * *."