Mass. Gen. Laws ch. 183, § 7: Conveyance by grantor notwithstanding disseisin or adverse possession; title; grantee's rights

Section 7. A conveyance of land, if otherwise valid, shall, notwithstanding disseisin or adverse possession, be as effectual to transfer the title of the grantor as if he were actually seized and possessed of such land, and shall vest in the grantee the rights of entry and of action for recovery of the estate incident to such title.