Upon the trial by jury in the Circuit Courts of the Twelfth Judicial Circuit of any person indicted for a misdemeanor, or a felony not punished capitally, or upon appeals to the circuit courts from lower courts, the court shall require two lists of all the regular jurors empaneled for the week who are competent to try the defendant to be made, and the district attorney shall be required first to strike from the list the name of one juror, and the defendant shall strike one, and they shall continue to strike off names alternately until only 12 jurors remain on the list, and these 12 jurors thus selected shall be the jury charged with the trial of the case.