The second paragraph of that section is in these terms: "And where by reason of the antiquity of a tenancy no satisfactory evidence of its commencement is forthcoming, and there is not any such evidence of the period of its intended duration, if any, agreed upon between the landlord and tenant, or those under whom they respectively ' claim title or any usage of the locality as to duration of such tenancy, it shall, as against the immediate landlord of the tenant, be presumed to be co extensive with the duration of the tenure of such landlord and of those who derive title under him." Under this section, therefore, a permanent tenant is one whose tenure is co extensive with that of his landlord and a tenant is to be presumed to be such a tenant when by reason of antiquity, the commencement of the tenancy cannot be proved and there is no satisfactory evidence of the agreed duration of the tenancy or of any usage of the locality as 445 to such duration.