4. (1) For the purpose of calculating the net income under section 3, the Revenue-officer shall publish a proclamation in the prescribed manner in every village requiring the rent-receivers concerned to furnish, within sixty days from the date of publication of the proclamation or within such further time as may be allowed by the Revenue-officer on application, statements in the prescribed forms showing therein their gross assets and deductible amounts as referred to in sub-section (2) of section 3 and such other particulars as may be prescribed: Provided that the Government may, at any time, by notification in the official Gazette, allow such of the rent-receivers, as have not already furnished such statements in pursuance of the said Proclamation, a second opportunity to furnish the same to the Revenue-Officer within such period as may be specified in the notification. (2) The net income shall be calculated by the Revenue-officer after considering the returns furnished under sub-section (1) and making such enquiry as he thinks fit. (3) The submission of the statements required under sub-section (1) shall be the condition precedent to the making of ad-interim payments under section 3.