17. Extra compensation prohibited; increase or decrease of compensation during term of office

Section 17. The legislature shall never grant any extra compensation to any public officer, agent, servant or contractor, after the services shall have been rendered or the contract entered into, nor shall the compensation of any public officer, other than a justice of the peace, be increased or diminished during his term of office; provided, however, that when any legislative increase or decrease in compensation of the members of any court or the clerk thereof, or of any board or commission composed of two or more officers or persons whose respective terms of office are not coterminous, has heretofore or shall hereafter become effective as to any member or clerk of such court, or any member of such board or commission, it shall be effective from such date as to each thereof.