soldiers would not carry their baggage; an army of porters had to be assembled. The soldiers also refused to go to regions remote from their homes until they were given extra pay. Such allowances gradually became customary, and so the military expenditure grew by leaps and bounds without any corresponding increase in the striking power of the army. The government was unable to meet the whole cost of the army out of taxation revenue. The attempt was made to cover the expenditure by coining fresh money. In connection with the increase in commercial capital described above, and the consequent beginning of an industry, China's metal production had greatly increased. In 1050 thirteen times as much silver, eight times as much copper, and fourteen times as much iron was produced as in 800. Thus the circulation of the copper currency was increased. The cost of minting, however, amounted in China to about 75 per cent and often over 100 per cent of the value of the money coined. In addition to this, the metal was produced in the south, while the capital was in the north. The coin had therefore to be carried a long distance to reach the capital and to be sent on to the soldiers in the north. To meet the increasing expenditure, an unexampled quantity of new money was put into circulation. The state budget increased from 22,200,000 in A.D. 1000 to 150,800,000 in 1021. The Kitan state coined a great deal of silver, and some of the tribute was paid to it in silver. The greatly increased production of silver led to its being put into circulation in China itself. And this provided a new field of speculation, through the variations in the rates for silver and for copper. Speculation was also possible with the deposit certificates, which were issued in quantities by the state from the beginning of the eleventh century, and to which the first true paper money was soon added. The paper money and the certificates were redeemable at a definite date, but at a reduction of at least 3 per cent of their value; this, too, yielded a certain revenue to the state.