91. (1) The Government may, subject to the condition of previous publication, make rules for carrying out the purposes of this Act. (2) In particular and without prejudice to the generality of the foregoing power, such rules may provide for all or any of the following matters, namely:- ¹[* * *](c) the manner of determining compensation referred to in the proviso to sub-section (1) of section 9 and in the proviso to section 20;(d) the forms of the notices referred to in section 23, and the amount of the process-fees referred to in the said section; ²[* * *] ³[(rr) the Revenue-officer referred to in sub-section (1) of section 68;](s) the manner of service of notice issued under this Act where the mode of such service is not provided in this Act.