[ULPIANUS libro trigensimo secundo ad edictum. ] §18.2.16.prImperator Seuerus rescripsit: 'Sicut fructus in diem addictae domus, cum melior condicio fuerit allata, uenditori restitui 'necesse est, ita rursus quae prior emptor medio tempore necessario probauerit erogata, 'de reditu retineri uel, si non sufficiat, solui aequum est'. et credo sensisse principem de empti uenditi actione.
[ULPIAN, On the Edict, book 32.] The Emperor Severus replied by rescript: 'Just as it is necessary that the fruits of a house adjudged subject to a better offer by a certain day be restored to the seller when a better condition has been brought, so on the other hand it is equitable that what the prior buyer proves to have been necessarily expended in the meantime be retained from the income or, if it is not sufficient, be paid.' And I believe that the emperor was thinking of the action on purchase and sale.