A sold a block of land to B, in 1865. B took possession, and by mistake fenced in 20 feet not sold or conveyed to him. In 1878 B sold the block of land back to A, who, without taking actual or formal possession, sold it to C, who kept possession until 1887. In 1887 D, who had bought adjoining land from A, including this 20 feet improperly fenced in by B, brought an action of ejectment against C to recover the 20 feet. C claimed possession by reason of adverse possession for the statutory period.