交易之媒介物日货币。货币之币材,有金,有银,有铜。故世界各国之本位制度,亦有金本位,银本位,金银复本位制数种。治吾国之古代货币史者,类多注意於历代之制钱铜币,述之至为详尽,而颇忽於金银。不知吾国自三代以来,作交易媒介物者,有刀,有布,有金,有银,有毯,有贝,有铁钱有珠玉, The medium of exchange. Money currency, gold, silver, copper. Therefore, the standard system of all countries in the world also has the gold standard, the silver standard and the gold and silver complex standard system. Governance our country’s ancient currency history, class pay more attention to the ancient system of copper coins, described as detailed, but rather suddenly in gold and silver. I do not know my country since the third generation as a medium of exchangers, a knife, a cloth, gold, silver, a blanket, shellfish, there are iron and silver beads,