(1)The amount of the annual subscription payable by members of the Society shall be fixed from time to time by the Council.
(2)In fixing the amount of the annual subscription, the Council shall be at liberty—
(a)to divide members into classes;
(b)to provide that different amounts shall be paid by different classes and shall extend over different periods; and
(c)generally to regulate, and from time to time vary, as they think fit, the amounts payable by members or by different classes of members.