Cap. 16 Art. 480by merger or unity of possession,

(1) An easement is extinguished where the dominant and the servient tenements become united in the ownership of one person.

(2) Where, however, a visible sign of an easement exists, and the owner disposes of one of the said tenements without there being in the contract any declaration as to the easement, such easement shall continue to be operative, actively or passively, in favour of, or over, the tenement so alienated.