The several members of the commission and the secretary may, in the discharge of their duties, administer oaths and take affidavits. The commission and each member thereof may examine witnesses under oath in all matters coming before them. If any person shall testify falsely, or make any false affidavit or oath before the commission, or before any of the commissioners, or before any officer, to any matter coming before the commission, he shall be guilty of perjury, and, upon conviction, shall be punished according to law.