to follow, as if I say, I give you this thing that1 you will serve me well, the  same must still be said.2 If where the causa is to follow a condition is added, as where  I say, I give you this land if you will serve me well, the gift will be in suspense. 3It  will be in suspense until the condition occurs or does not; [if] it occurs it will be  complete and absolute, but subject to resolution under the condition if good service  does not follow.4
That a condition prevents descent to right heirs.
 A condition may prevent descent to right heirs against common right, as where I  say, I grant you so much land for the term of ten years after which it is to revert  to me, [but] if I die within the ten year term I grant for myself and my heirs that  the land remain to you for your life or in fee; thus it makes [of a term] a  free tenement or5 a fee and takes the assise of mortdancestor from heirs, for though  at first sight they have a direct action the termor will have an exception on the  agreement.6 Similarly, what at the beginning was a free tenement and for life may  by an agreement be changed into a term, as where one grants land to another for  life, the condition being made between them that if the tenant dies within a  certain time his heirs or assigns or his executors may hold the land so given for a  certain term after the tenant's death. Thus a condition makes of a term a free  tenement and conversely, and gives an exception against true lords and their  heirs. In the same way it furnishes an exception against the assise of novel  disseisin, as [in the case] of finding another in necessaries, adequately expounded  above. It also gives a creditor an exception against his debtor, the true lord and  his heirs, as where7 it is agreed between them at the outset that if his money is not  paid on the day the land given in gage may remain to the creditor and his heirs,  as below [in the portion on] the assise of mortdancestor,8 [the case] of the heir of  John Dacy.9 A condition also provides an exception against true heirs and the  assise of mortdancestor, as where one says, when about to go abroad, I grant to  A. such land of mine for a term certain (as in the case of crusaders) provided that  if I return he restore my land to me and if I die on the journey (or do not return)  it remain to A. in fee. If the condition that the traveller not return occurs and his  heir claims by assise of mortdancestor, an exception based on the condition will  bar him, [Thus the gift will be mixed, that is, a feoffment and a term; they have  one beginning but a different end, and since the term