Michigan Compiled Laws, Chapter 45. Counties § 45.41

Sec. 1. In all counties of this state having a population of more than 50,000 where it is provided by law that the county treasurer, county clerk and register of deeds shall receive salaries in lieu of fees, each of said officers may appoint a deputy or deputies who may perform all the official acts which the officer making such appointment might legally do, and who shall be paid therefor from the general fund of the county, such salaries as the board of supervisors of the county shall determine.