Questions which arise for our consideration and decision in the light of the aforesaid arguments of learned counsel for the contesting parties admit of their formulations thus: (1).Does the lease-hold of a tenant (lessee) in a property merge in mortgage security if the same property is given by the landlord (lessor) to the tenant (lessee) as a mortgage security under a mortgage by conditional sale,as would debar the tenant from desisting the suit of the landlord -mortgagor for recovery of possession of such property by obtaining a decree for redemption of the mortgage