§ 1251. The relation of landlord and tenant may be determined, 1st. By the happening of any event upon which the lease is limited; 2d. By the death of the lessor, if he be tenant for life, but not otherwise. The death of the lessor will not, however, determine the tenancy, and the executor or administrator, having the same interest as the testator or intestate, must resort to the same mode of determining the lease, and give a regular notice to quit.1 3d. By efflux of time, where the lease is for a certain definite term; 4th. By notice to quit; 5th. By forfeiture, or entry of the lessor; 6th. By merger; 7th. By surrender.