Copies of letters mainly from Josiah Wedgwood, senior, to his friend and (from November 1768) partner Thomas Bentley. They are arranged chronologically in eight volumes:
- (I) 1101, 1758-65;
- (II) 1102, 1766-67;
- (III) 1103, 1768;
- (IV) 1104, 1769;
- (V) 1105, 1770, January 24, 1771;
- (VI) 1106, January 29, 1771-77;
- (VII) 1107, 1778;
- (VIII), 1108, 1779.