198. Writing
Related to calendar and mathematics in its origin was writing, which passed out of the stage of pictographs and simple ideograms only in the Mexican area. The Aztecs used the rebus method (§ [130]), but chiefly for proper names, as in tribute lists and the like. The Mayas had gone farther. Their glyphs are highly worn down or conventionalized pictures, true symbols; often indeed combinations of symbols. They mostly remain illegible to us, and while they appear to contain phonetic elements, these do not seem to be the dominant constituents. The Maya writing thus also did not go beyond the mixed or transitional stage. The Chibcha may have had a less advanced system of similar type, though the fact that no remains of it have survived argues against its having been of any considerable development. The Peruvians did not write at all. They scarcely even used simple pictography. Their records were wholly oral, fortified by mnemonic devices known as quipus, series of knotted strings. These were useful in keeping account of numbers, but could of course not be read by any one but the knotter of the strings: a given knot might stand equally for ten llamas, ten men, ten war clubs, or ten jars of maize. The remainder of South America used no quipus, and while occasional pictographs have been found on rocks, they seem to have been less developed, as something customary, than among the North American tribes. All such primitive carvings or paintings were rather expressions of emotion over some event, concrete or spiritual, intelligible to the maker of the carving and perhaps to his friends, than records intended to be understood by strangers or future generations.
Connected with the fact that the highest development of American writing took place in southern Mexico, is another: it was only there that books were produced. These were mostly ritualistic or astrological, and were painted on long folded strips of maguey fiber paper or deerskin. They were probably never numerous, and intelligible chiefly to certain priests or officials.