Section 3. To section 4 of the said `t\` ct the following subseotions shall be added, namely :

3. To section 4 of the said `t\` ct the following subseotions shall be added, namely :- ' 6 (3) Tlie Governor General in Council may, by not,ifiaation in the official Gazette, alter or add to the schedule to this Act by prescribing now oc varied tests, and directions for preparing and u s i ~ ~ g them ; and all references in this ,4ct to the schedule, when altered or added to, shall be consti*ned as referring to the schedule as so al t,ered or added to for the time being. (4) The provisions of section 23 of the General lag?, Clauses Act, 1897, shall apply to notifications under sub-section (;3) as if t11e.y were rules or orders required to be made after previous publication. "