Quando hasta vel aliud corporeum quidlibet porrigitur a domino se investituram facere dicente; quae saltem coram duobus vasallis solemniter fiei debet

When a spear, or some other tangible thing, is presented by the lord saying that he thus made investiture; and this thing ought to be done solemnly in the presence of at least two vassals. See 2 Bl Comm 367.