The Greek potter never made any legitimate advance beyond the Red-figured Style of the fifth century. In the early part of the fourth century there is no appreciable change of style; the technique is a little more perfect, the aim is a little less vigorous. The series of Panathenaic amphoræ[101] (those large jars painted with figures of Athena and athletic subjects intended for prizes at the Panathenaic games) continues unbroken, and their design changes little because they have to correspond with a conventional type. The custom was that they should have their figures in black, and accordingly the painter obeyed the custom by leaving parts of his vase in the natural red of the burnt clay, and treating those parts as
panels on which he painted his figures in black.[102] One change we notice: vases are no longer signed by the artist. We conclude from this that pottery is no longer assigned to known masters like Hieron and Douris for decoration, but more mechanically produced in large numbers by humble craftsmen in factories. This would correspond with the increased professionalism which characterises this period in all departments of life. Towards the end of the century--that is, in the days of Alexander--it appears that vases were more frequently made in metal; not that we have any metal vases surviving, but the earthenware takes forms which can only be explained as imitation of metal. Thus the surface is often raised in relief, and vases are apparently cast in moulds.
Coins and gems[103] exhibit increased technical mastery. It must not be forgotten that coin types, being generally of religious significance, are apt to be very slow in responding to the artistic fashions of the day. This is especially the case with Athenian coinage. The Athena type with owl and olive-branch on the reverse is always of a conventional and somewhat archaic character. Elsewhere the coins and gems of the fourth century reach their highest point of perfection, and that is a point which has never been surpassed. As usual, Syracuse is in the forefront for beauty of design, and her new series of tyrants, Dionysius I. and II., revive the glorious types of Gelo and Hiero and improve them. The decadrachms of this period representing the head of the nymph Arethusa surrounded with dolphins and bearing on the reverse a four-horse chariot at full gallop are regarded by numismatists as the most beautiful coins in existence. The best of these bear the signature of their engraver, Euænetus. A gold coinage began here about the time of the repulse of the Athenian Armada. Corinthian coins with the flying Pegasus on the obverse and a head of Athena in a Corinthian helmet on the reverse also attain the summit of their beauty in this century. But even out-of-the-way places like Panticapæum, the corn depot of Southern Russia, and the little island of Tenedos, which to the historian _est in conspectu_ and little more, employed engravers of consummate art. Just before the beginning of the century three cities of the island of Rhodes united to form one republic, which rapidly rose to wealth by way of commerce and good government. It produced a gold coinage of great excellence, the figure of the sun-god Helios on the obverse and a rose (Rhodes) as a punning emblem on the reverse. It is only with Alexander the Great and his successors that the portraiture of mortal rulers begins to appear on Greek coinage. It is then rapidly developed, and some of the barbarian monarchs of the East are portrayed by Greek artists with great vigour and realism.