Michigan Compiled Laws, Chapter 4. Legislature § 4.41

Sec. 1. It shall be the duty of the secretary of state on or before the day prior to the first annual regular session of each legislature, to deliver to the secretary, or in case of his death or inability, then to the assistant secretary of the preceding senate, also to the clerk, or in case of his death or inability, then to the journal clerk of the next preceding house of representatives, a true and correct list of all the members elect of each house, as transmitted to him by the clerks of the several counties of the state, and in such list shall designate the senators and representatives by their respective districts.