Section 6(iv) in The Bengal Rent Settlement Act, 1879
(iv)that the value of the produce of the land has been increased otherwise than by the agency, or at the expense, of the raiyat since the last previous settlement of the lands was made; and that such higher rent does not bear a higher proportion to that which would have been the rent of lands of a similar description and the same area according to the normal price of produce at or about the time of the present settlement bears to the normal price of similar produce which prevailed at or about the time of such previous settlement, as recorded in the papers of such settlement, or as otherwise ascertained and certified by the Settlement-officer;
