Figure 2  Canning jars, Hare Pottery, Wilmington, Delaware, ca. 1860. Salt-glazed stoneware. H. 8 3/4", 7 1/2", and 8". (Right, left: Courtesy, private collection; center: Courtesy, Delaware State Museum; photo, Charles Fithian.) All are impressed: “wm hare / wilmington del.” Manufactured to preserve fruits and other foodstuVs, this vessel type is the predecessor of the glass Mason jar.