Section 4. The Justices of the Supreme Court, the Chancellor and Vice-Chancellor or Vice-Chancellors, and the President Judge and Associate Judges of the Superior Court and of the Orphans' Court shall respectively receive from the State for their services compensations which shall be fixed by law and paid monthly and they shall not receive any fees or perquisites in addition to their salaries for business done by them except as provided by law. They shall hold no other office of profit.