Sentence:  <WSD>Interversion</WSD> is effected by a conveyance from the owner of land to his tenant, who thereafter will hold in virtue of the extrinsic cause contemplated by the rule, and also when the land comes to the tenant by descent. 
Meaning of the word marked with <WSD> tags:  The process of changing a subsidiary title, such as that of a tenant, to one that is independently held.