(1)  No one shall be convicted of treason (unless he pleads guilty) except upon the evidence of 2 witnesses to one overt act of the kind of treason with which he is charged, or upon the evidence of one witness to one such act and one other witness to another such act.

(2)  No one shall be liable to be indicted or tried for treason unless the indictment is filed within 3 years next after the crime was committed.

(3)  The provisions of this section shall apply only to treason other than by killing His Majesty, or cases where the overt act alleged is any attempt to injure his person in any manner whatever, every of which crimes may be proved by the like evidence as any other crime.