Mississippi Code Title 5. Legislative Department § 5-1-9

At the hour of twelve o'clock, noon, on the day appointed for the meeting of any regular session of the legislature the secretary of state shall take the chair in the hall of the house of representatives, and call over the roll of counties in alphabetical order, and of the representative districts composed of more or less than one county. Upon the call of such roll the members-elect therefrom shall present their certificates of election, which shall be prima facie evidence of the right to membership. After the call of the roll and the presentation of said certificates, each member so present shall then take the oath of office prescribed by section forty of the constitution, which oath may be administered by the secretary of state. The secretary of state shall cause to be kept, by the clerk of the last house or other suitable person, a record of the proceedings of organization, which shall form a part of the journal of the house. At any other than a regular session, a new member, on presentation of his certificate of election, shall be sworn as in other cases.