83. (1) Every provident society ¹[shall cause every scheme of insurance which it proposes to put into operation] to be examined by an actuary, and shall not receive any premium or contribution in connection with the scheme until the actuary has certified that the rates, advantages, terms and conditions of the scheme are workable and sound, and such certificate has been forwarded to the Chief Controller of Insurance. (2) The provisions of sub-section (1) shall apply to any alteration of a scheme already in operation but the Chief Controller of Insurance may, if he is of opinion that the alteration unfairly affects the interests of existing policy-holders, prohibit the alteration, and, if he does so, the society shall not put the altered scheme into operation, unless it first discharges to the satisfaction of the Chief Controller of Insurance all its liabilities to those of the existing policy-holders who dissent from the alteration.