heirs fail in the life of the donor, then what was said immediately above will be applicable.  If the donee or his heirs or both survive, [but the donor dies], the thing  given then reverts to the heirs of the donor by writ of entry, as above. If when the gift  is made to the donee and his heirs for the life of the donor the donee dies first, his  heirs succeed him by hereditary right as to a fee,1 as long as the donor lives; after the  donor's death it ceases to be the donee's fee and begins to be the fee of the donor.  But if the gift is made thus, for life etc.2[as above.]
In his demesne etc.
 It is said [in the writ] in his demesne. We therefore must see, first of all, what may be  held in demesne. A tenement, a rent and everything else for which an assise of novel  disseisin of a free tenement may be had if3 they are held for life or in fee, for things  held in fee the assise of mortdancestor lies for heirs, whoever is in possession. [The  word demesne is taken in many ways. Demesne is what one has for supplying his  table, such as are called in English board-lands. A villeinage given to villeins,  which one may recall and revoke at will, in season and out, is also called demesne.  That may also be called demesne of which one has the free tenement and another the  usufruct, [or] of which one has the free tenement and another the wardship, [or]  another the care, as a guardian or a curator, one provided by law, the other by man.]  And generally, however and whenever one is enfeoffed in fee to himself and his heirs,  or [holds in fee] by the causa of succession, so that he could have the assise of novel  disseisin if he were ejected while alive, the assise of mortdancestor lies for his heirs  after his death, if he dies seised. It is clear that it is called demesne to distinguish it  from that which is held in service. Hence we say every day that we must see what a  man holds in demesne and what in service. It is regularly true that demesne may be  called the entire tenement of which the ancestor died seised as of fee, whether with the  usufruct or without it, [without it, because] if he were ejected while alive he could  recover by an assise of novel disseisin though another had the usufruct, and hence in  order to make clear his ancestor's seisin, the assise of mortdancestor lies at once for  the heir,