Section 3
SEC. 3. No officer in any branch of the public service, or any other person, whose salary, pay, or emoluments are fixed by law or regulations, shall receive any additional pay, extra, allowance or compensation in any form whatever for the disbursement of public money, or for any other service or duty whatever, unless the same is authorized by law, and the appropriation therefor explicitly states that it is for such additional pay, extra allowance or compensation: Provided, however, That the employment of clerks and employees in the various civil Departments as evening or night teachers in the public schools is hereby authorized, such salaries being hereby made a proper charge against the appropriations available for the payment of salaries of teachers.