In all elections by the Senate and House of Representatives, jointly or separately, the vote shall be given viva voce, except in the election of their officers.
Tex. Const. art. 3, § 41, under Legislative Department.
Tex. Const. art. 3, § 41
ELECTIONS BY SENATE AND HOUSE OF REPRESENTATIVES
In all elections by the Senate and House of Representatives, jointly or separately, the vote shall be given viva voce, except in the election of their officers.