As Soutzo has observed, the degradation of the local copper series moved on most unequal lines, and no doubt in some places the _decussis_ did not represent perhaps one half the value of its archetype, the sheep, whilst at the same moment the copper unit in another community stood at almost its original weight and value. Where silver was coined the degradation of copper went on all the quicker; there was a tendency more and more to get rid of the old cumbrous copper coins, and to employ those of a lighter and more portable size. Moreover the inter-relations between copper and silver made the coinages in these metals act and react upon each other. Thus the state after reducing the copper would reduce likewise the silver, so as to make the two series correspond. This was probably facilitated in some cases at least by the change in the relative value of these metals. Italy was not a silver-producing region, whilst it was rich in copper. Naturally with the increase of commerce and the development of silver mines in neighbouring countries such as Spain, silver became more abundant and the price of copper rose accordingly. We have had occasion already to remark that the abundance or scarcity of gold or silver is indicated by its being employed or not for coinage. In the case of gold we know that it is only when the supply of that metal is in excess of its demand for purposes of ornament that it is or can be employed in the form of coined money. The history of the coinage of Persia, Lydia, Macedonia, Rhodes and elsewhere in ancient times, as well as the history of mediaeval gold coining, make this evident, whilst modern Hindustan teaches us the same lesson. Of course in times of great financial straits under the pressure of war a gold coinage was sometimes issued, as perhaps at Athens[439] in 407 B.C. and as at Rome during the second Punic war in 206 B.C. Backwardness in the coinage of silver among certain peoples is probably to be accounted for in the same way. The employment of iron money at Sparta (and Byzantium) was probably due to the dearth of precious metals rather than to any ordinance of Lycurgus against the employment of the latter. If accordingly we find that Rome did not coin silver until 268 B.C. we are justified in concluding that it was from want of silver she had been so long in following the example of the Etruscans and the Greeks. It is certainly most significant that within four years after the capture of Tarentum (272 B.C.) and the subjugation of all Southern Italy we find her issuing a well-matured silver currency. Doubtless by her conquests she obtained a vast supply of the precious metal, for we know from the records of Livy and Pliny that great masses of foreign coins and bullion flowed into the treasury after every fresh conquest. We may therefore reasonably assume that previous to 272 B.C. silver had been much dearer in relation to copper.