But it is essential to the validity of a lease that the lessor has, at the time he undertakes to make the grant, possession of the premises; other- wise, whatever he does will amount to nothing more than the assignment of a chose in action; Cro. Car. 109; Shep. Touchst. 269. But possession is always presumed to follow the title unless there is a clearly marked adverse possession. And although a lease may not be suffi- cient to authorize a lessee to demand possession for the want of a possessory title in his lessor, it will still operate by way of estoppel, and enure to his benefit if the lessor afterwards comes into possession of the land before the expiration of the lease; Bacon, Abr. Leases (I4); 61 N.Y.6; 7 M. &