Section 5. The salaries of county commissioners, payable by their respective counties in full for all services performed by said commissioners except as otherwise provided, shall be as follows:—

   Middlesex..... $9,505.16
Essex..... 8,799.73
Norfolk..... 8,799.73
Worcester..... 8,799.73
Bristol..... 7,388.87
Hampden..... 7,388.87
Barnstable..... 6,683.44
Berkshire..... 6,683.44
Plymouth..... 6,683.44
Franklin..... 5,272.58
Hampshire..... 5,272.58
Dukes..... 2,963.90