[26] It appears from Golownin that there are also smaller packages, of which three make the large one. The price of rice varied, of course; but Kämpfer gives five or six taels of silver as the average value of the koku. Titsingh represents the koku as corresponding to the gold koban, the national coin of the Japanese. The original koban weighed forty-seven kandarins, or rather more than our eagle; but till the year 1672 it passed in Japan as equivalent to about six taels of silver. The present koban contains only half as much gold; and yet, as compared with silver, is rated still higher. The koban is figured by Kämpfer as an oblong coin rounded at the ends, the surface, on one side, marked with four rows of indented lines, and bearing at each end the arms or symbol of the Dairi, and between them a mark showing the value, and the signature of the master of the mint. The other side was smooth, and had only the stamp of the inspector-general of gold and silver money. Kämpfer also figures the _ōban_, which even in his time had become very rare, similar to the koban, but of ten times the weight and value. A third gold coin was the _ichibu_, figured by Kämpfer as an oblong square. According to Thunburg, it was of the value of a quarter of the koban. Silver passed by weight. The Japanese do not appear to have had any silver coins, unless lumps of irregular shape and weight, but bearing certain marks and stamps, were to be so considered. In ordinary retail transactions copper _zeni_, or _kas_, as the Chinese name was, were employed. They were round, with a square hole in the middle, by which they were strung. Some were of double size and value, and some of iron. For further information on the Japanese monetary system, and on the present state and value of the Japanese circulating medium, see Chapters XXV, XXXVIII, and XLV. [27] Dairi, in its original sense, is said by Rodriguez, in his Japanese grammar, to signify rather the court than the person of the theocratic chief to whom it is applied; and so of most of the titles mentioned in the text. [28] According to Rodriguez, there had been also an ancient military nobility, called _buke_; but in the course of the civil wars many families of it had become extinct, while other humble families, who had risen by way of arms, mostly formed the existing nobility. [29] According to the Japanese historical legends, the office of Kubō-Sama, originally limited to the infliction of punishments and the suppression of crimes, was shared, for many ages, between the two families of Genji and Heiji, till about 1180, when a civil war broke out between these families, and the latter, having triumphed, assumed such power that the Dairi commissioned Yoritomo, a member of the defeated family of Genji, to inflict punishment upon him. Yoritomo renewed the war, killed Heiji, and was himself appointed Kubō-Sama, but ended with usurping a greater power than any of his predecessors.