On extraordinary occasions, the Governor may convene the Legislature by proclamation, in which shall be stated the purpose for which the Legislature is to be convened, and it shall transact no legislative business except that for which it was especially convened, or such other legislative business as the Governor may call to its attention while in session. The Legislature, however, may provide for the expenses of the session and other matters incidental thereto. The Governor may also by proclamation convene the Senate in extraordinary session for the transaction of executive business.