Section 3. The Legislature that shall meet in regular session A. D. 1925, and those that shall meet every ten years thereafter, shall apportion the representation in the Senate, and shall provide for forty (40) Senatorial Districts, such Districts to be as nearly equal in population as practicable, but no County shall be divided in making such apportionment, and each District shall have one Senator; provided that Broward County, Florida, shall constitute the Thirty-ninth (39th) Senatorial District, and Calhoun County, Florida, and Gulf County, Florida, shall constitute the Fortieth (40th) Senatorial District; and, at the same time, the Legislature shall also apportion the representation in the House of Representatives, and shall allow three (3) Representatives to each of the five most populous counties, and two (2) Representatives to each of the next eighteen more populous counties, and one Representative to each of the remaining counties of the State at the time of such apportionment. Should the Legislature fail to apportion the representation in the Senate and in the House of Representatives, at any regular session of the Legislature at any of the times herein designated, it shall be the duty of the Legislature or Legislatures succeeding such regular session of the Legislature, either in Special or Regular session, to apportion the representation in the Senate and in the House of Representatives, as herein provided. The preceding regular Federal or regular State Census, whichever shall have taken nearest any apportionment of Representatives in the Senate and in the House of Representatives, shall control in making such apportionment. In the event the Legislature shall fail to reapportion the representation in the Legislature as required by this amendment, the Governor shall (within thirty days after the adjournment of the regular session), call the Legislature together in extraordinary session to consider the question of reapportionment and such extraordinary session of the Legislature is hereby mandatorily required to reapportion the representation as required by this amendment before its adjournment (and such extraordinary session so called for reapportionment shall not be limited to expire at the end of twenty days or at all, until reapportionment is effected, and shall consider no business other than such reapportionment).