Tex. Const. art. III, § 40
Special Sessions; Subjects of Legislation; Duration
Effective Feb 15, 1876(Feb. 15, 1876.)State of Texas
When the Legislature shall be convened in special session, there shall be no legislation upon subjects other than those designated in the proclamation of the Governor calling such session, or presented to them by the Governor; and no such session shall be of longer duration than thirty days.
(Feb. 15, 1876.)