48. The Government may order that the provisions of section 89 shall apply to any public officer or employee, instead of the provisions of sections 40 to 43, and the order to that effect made by it shall be irrevocable and shall have effect as from the appointment, even if the latter is prior to the 1st of April, 1942, provided that the deduction required by section 18 be made since the appointment.
R. S. 1964, c. 14, s. 37.