§ 42. Register of county. Any act done in pursuance of law by the register of a county shall be deemed to be a compliance with any provision of law authorizing or requiring such act to be done by the county clerk of such county, and any instrument or writing filed, entered or recorded in pursuance of law in the office of a register of a county, shall be deemed to be a compliance with any provision of law authorizing or requiring such paper to be filed, entered or recorded, as the case may be, in the office of the clerk of such county. The term county clerk when used in relation to conveyances of real property or the filing or recording of instruments which are or may be filed in the office of the register of a county, shall include the register of each county in which there is a register.