Page:William Blackstone, Commentaries on the Laws of England (3rd ed, 1768, vol II).djvu/211

 Ch. 13. right of poeion, and I retain nothing but the mere right of property. And even this right of property will fail, or at leat it will be without a remedy, unles I purue it within the pace of ixty years. So alo if the father be tenant in tail, and alienes the etate-tail to a tranger in fee, the alienee thereby gains the right of poeion, and the on hath only the mere right or right of property. And hence it will follow, that one man may have the poeion, another the right of poeion, and a third the right of property. For if tenant in tail enfeoffs A in fee-imple, and dies, and B dieies A; now B will have the poeion, A the right of poeion, and the iue in tail the right of property: A may recover the poeion againt B; and afterwards the iue in tail may evict A, and unite in himelf the poeion, the right of poeion, and alo the right of property. In which union conits,

IV. title to lands, tenements, and hereditaments. For it is an antient maxim of the law, that no title is completely good, unles the right of poeion be joined with the right of property; which right is then denominated a double right, jus duplicatum, or droit droit. And when to this double right the actual poeion is alo united, when there is, according to the expreion of Fleta, juris et eiinae conjunctio, then, and then only, is the title completely legal.