Section 19
SEC. 19. No person serving as a stenographer and typewriter, at present appropriated for at an animal compensation of one thousand two hundred dollars, or less, shall be promoted to the one thousand four hundred dollar per annum class, as herein provided for such employees in each office, until after six months' service and until he shall have passed the examination in stenography and typewriting prescribed by the Civil Service Board or by the "United States Civil Service Commission.