The proof and acknowledgment of instruments required by law to be registered in the office of the register of deeds of a county, and all privy examinations of a feme covert to such instruments made before any notary public on or since March 11, 1907, are hereby declared valid and sufficient, notwithstanding the notary may have been interested as attorney, counsel or otherwise in such instruments. (Ex. Sess. 1908, c. 105, s. 2; C.S., s. 3344.)