The district attorney of the Second Judicial District of this state, shall, in addition to the salary now paid him by the State of Louisiana, be paid an additional salary of four thousand three hundred dollars, by the parishes comprising the said judicial district, apportioned as follows:
By the parish of Claiborne, the sum of $1,800.00 per annum;
By the parish of Bienville, the sum of $1,500.00 per annum;
By the parish of Jackson, the sum of $1,000.00 per annum.