Section 7(4) in The Legislative Councils Act, 1957
(4)In order that, as nearly as may be, one- third of the members of the said Council may retire on the 20th April, 1958 , and on the expiration of every second year thereafter, the Governor of Madras shall, after consultation with the Election Commission, make by order, such provisions as he thinks fit in regard to the terms of office of the members to be elected under clause (a) of sub- section (3) and of the member to be nominated under clause (b) of that sub- section.
