Most of the industries carried on in any large city were to be found in Athens, but the industry for which she was best known throughout the Mediterranean world was that of the potter, and Athenian vases were exported in very large quantities. But these vases were not mere ornaments; each had its own particular use as a household utensil, an offering to a god, or as an offering at a tomb. Vases for different purposes were made of different shapes; each was beautiful in form, but with its beauty it combined usefulness. The handles on the water jars are placed just where they are most needed, the oil pours out of the narrow neck of the oil jug drop by drop so that the quantity could be easily regulated, and the drinking cup has a slight curve to the rim, so that one can drink out of it quite easily without spilling the liquid. There are certain well known forms of these vases: the Amphora is a large two-handled vase which was used for storing oil and other liquids; the Hydria has three handles and was used for carrying water; the Krater is a large vase in which wine and water were mixed; the Lekythos is a jug {204} with a narrow neck used for pouring out oil slowly in small quantities; and the Kylix is a wide and shallow drinking cup. A large amphora, often full of oil, was given as a prize for some of the athletic contests at the Panathenaic games held in Athens. Such an amphora can always be recognized, as it bears on one side the figure of Athena with the inscription: "I am from the Games at Athens," and on the other a painting depicting the contest for which the vase was a prize. The quarter in Athens given up to the potters was known as the Cerameicus, and here there were a number of workshops owned by different vase-makers. At the head of each establishment was the master; but he was a craftsman as well as manager and was able to do everything connected with the industry: he could not only make the vase, but also design and paint it. His workmen, however, did most of the turning, shaping and polishing of the vases. When the vase had been made, it was given to the artist who painted the design on it, after which it had to be dried, baked and glazed. The black glaze that was used in Athens was one of the great discoveries of the ancient potters' art. Time never spoiled it, and it seems as fresh today as when it was first put on the vases. In some cases it has peeled off in small flakes, but that only happens when the clay beneath is damp; otherwise it remains unchanged. [Illustration: GREEK VASES. Courtesy of the Metropolitan Museum of Art.] The earlier vases were painted in black on the red background of the clay; later, the artist sketched his design on the red clay and gave the vase back to {205} the workman, who painted in the background in black and then returned it to the artist, who retouched his design and in some cases added here and there a touch of colour.