acknowledgement and recognition of the title of the vendor which excludes the theory of adverse possession. The well settled rule of law is that if a person is in actual possession and has a right to possession under a title involving a due recognition of the owner's title his possession will not be regarded as adverse in law, even though the claims under another title having regard to the well-recognised policy of law that possession is never considered adverse if it is referable to a lawful title. The purchaser who got into possession under an executory contract of sale in a permissible character cannot be heard to contend that his possession was adverse. In the conception of adverse possession there is an essential and basic difference between a case in which the other party is put in possession of property by an outright transfer, both parties stipulating for a total divestiture of all the rights of the transferor in the property, and in case in which there is a mere executory agreement of transfer both parties contemplating a deed of transfer to be executed at a later point of time. In the latter case the principle of estoppel applies estopping the transferee from contending that his possession, while the contract remained executory in stage, was in his own right and adversely against the transferor. Adverse possession implies that it commenced in wrong and is maintained against right. When the commencement and continuance of possession is legal and proper referable to a contract, it cannot be adverse.”