Officers were established in each of the districts, who, under the title of quipucamayus, Or "keepers of the quipus," were required to furnish the government with information on various important matters. One had charge of the revenues, reported the quantity of raw material distributed among the laborers, the quality and quantity of the fabrics made from it, and the amount of stores, of various kinds, paid into the royal magazines. Another exhibited the register of births and deaths, the marriages, the number of those qualified to bear arms, and the like details in reference to the population of the kingdom. These returns were annually forwarded to the capital, where they were submitted to the inspection of officers acquainted with the art of deciphering these mystic records. The government was thus provided with a valuable mass of statistical information, and the skeins of many-colored threads, collected and carefully preserved, constituted what might be called the national archives.5 But, although the quipus sufficed for all the purposes of arithmetical computation demanded by the Peruvians, they were incompetent to represent the manifold ideas and images which are expressed by writing, Even here, however, the invention was not without its use. For, independently of the direct representation of simple objects, and even of abstract ideas, to a very limited extent, as above noticed, it afforded great help to the memory by way of association. The peculiar knot or color, in this way, suggested what it could not venture to represent; in the same manner-to borrow the homely illustration of an old writer--as the number of the Commandment calls to mind the Commandment itself. The quipus, thus used, might be regarded as the Peruvian system of mnemonics. Annalists were appointed in each of the principal communities, whose business it was to record the most important events which occurred in them. Other functionaries of a higher character, usually the amautas, were intrusted with the history of the empire, and were selected to chronicle the great deeds of the reigning Inca, or of his ancestors.6 The narrative, thus concocted, could be communicated only by oral tradition; but the quipus served the chronicler to arrange the incidents with method, and to refresh his memory. The story, once treasured up in the mind, was indelibly impressed there by frequent repetition. It was repeated by the amauta to his pupils, and in this way history, conveyed partly by oral tradition, and partly by arbitrary signs, was handed down from generation to generation, with sufficient discrepancy of details, but with a general conformity of outline to the truth.