Mississippi Constitution Art. 5, § 121

The Governor shall have power to convene the Legislature in extraordinary session whenever, in his judgment, the public interest requires it. Should the Governor deem it necessary to convene the Legislature he shall do so by public proclamation, in which he shall state the subjects and matters to be considered by the Legislature, when so convened; and the Legislature, when so convened as aforesaid, shall have no power to consider or act upon subjects or matters other than those designated in the proclamation of the Governor by which the session is called, except impeachments and examination into the accounts of state officers. The Legislature, when so convened, may also act on and consider such other matters as the Governor may in writing submit to them while in session. The Governor may convene the Legislature at the seat of government, or at a different place if that shall become dangerous from an enemy or from disease; and in case of a disagreement between the two Houses with respect to time of adjournment, adjourn them to such time as he shall think proper, not beyond the day of the next stated meeting of the Legislature.