ten pounds a year. Therefore we order you without delay to cause the same B. to have  and to be assigned in escambium for the said land, from the land of that C. in your  county, ten librates of land by the view of lawful men of your county and by a reasonable  extent. And make known to us, by your sealed letters and by two or those by  whose oaths that valuation and assignment has been made, what and where and by  what parcels you have assigned that land to him. And have there this writ and the  names of those by whom etc. Witness etc. If the extent is challenged, let the procedure  be [as elsewhere, of extents.]1
A case where one may have the principal thing and escambium as well.
 In certain circumstances one may have the principal thing and escambium as well.  For example, a chief lord, in possession of land by reason of the wardship of two  brothers, enfeoffs the younger of that land; the older brother brings an assise of mortdancestor  against the younger and the latter vouches the chief lord to warranty;  when he has warranted, the older recovers seisin against him and the chief lord gives  escambium to the younger. The older having died without an heir of his body, the  chieflord seizes the land into his own hand; the younger brother claims it against him  by an assise on the death of his brother and the chieflord objects that he cannot claim  the land since he has escambium therefor. In truth he may [claim] the land in demesne  because of the descent and also retain the escambium because of the feoffment; thus  both, but on different grounds.
If a tenant vouches a warrantor resident outside the realm who has nothing in the realm by which he may be distrained; if he is beyond the potestas of the king let him produce him, if he so wishes, because he will not have help.
 We have spoken above of those who vouch a warrantor by aid of the court, within the  realm, where the lord king has the power to distrain the vouchee to come and warrant.2  Now we must explain what happens if the tenant vouches a warrantor resident  outside the realm, who has nothing in the realm of England by which he may be distrained.  We must see whether the king has the power to distrain him or does not; if  not, as where he is in the potestas of the king of France or Germany and the like, even  though aid is granted to him who seeks it, it will be worthless: the tenant3 must produce  him himself, otherwise he will remain in default.