Lease-hold held by a tenant or a lessee being a lesser estate and the right of reversion of the landlord (lessor) being a higher estate,the lessee's lease-hold right in respect of the property merges in reversion when that right of reversion,i.e.,the landlord's (lessor's) right of reversion comes to the tenant or lessee which happens when the landlord having a right to sell his reversion to the tenant holding the lease-hold sells the whole of it to the tenant (lessee).But,in view of the arguments advanced on behalf of the plaintiff-appellant,what has to be seen is if the landlord of a property,the lease-hold of which is already with the tenant,gives that very property as mortgage security to the tenant (lessee) by executing a mortgage by a conditional sale for the amount borrowed by him from the latter,does merger of lease-hold right in that mortgage security occur