Edward Burnett Tylor,
Researches into the Early History of Mankind and the Development of Civilization
(1878)
“ The quipu is a near relation of the rosary and the wampum-string. It consists of a cord with knots tied in it for the purpose of recalling or suggesting something to the mind. When a farmer's daughter ties a knot in her handkerchief to remember a commission at market by, she makes a rudimentary quipu. Darius made one when he took a thong and tied sixty knots in it, and gave it to the chiefs of the Ionians, that they might untie a knot each day, till, if the knots were all undone, and he had not returned, they might go back to their own land. ”
