I have as yet found no account of the lesser divisions of time in Peru, but note that the period of thirty days consisted of six periods of five days each, a subdivision which would obviously accord with native habits of thought if associated with the six terrestrial directions in space and if a reunion of people and collection of produce from four quarters took place on every fifth day in the capital. In my special work on the Calendar systems of ancient America I shall be able to discuss more fully their intimate indissoluble relation to the regulation of labor and control of the food supply absolutely requisite for the great capital. The idea of rotation was carried out in a ceremony described by Molina. When the December moon was full, after having ploughed their fields during twelve days, “all persons returned to Cuzco ... the people went to a house called moro-uco, near the houses of the Sun and took out a very long cable which was kept there, woven in four colors, black, white, red and yellow, at the end of which was a stout ball of red wool. Everyone took hold of it, the men on one side, the women on the other, performing the sacred dance called yaquayra. When they came to the square ... they went round and round until they were in the shape of a spiral shell. Then they dropped the cable on the ground and left it coiled up like a snake. The people returned to their places and those who had charge of the cable took it back to its house.” An extremely important instance of the application of the spiral is preserved in an illustration in the Account of the Antiquities of Peru by the native chronicler Salcamayhua (ed. Hakluyt, p. 109). He relates that the Inca Huayna-Capac, when he reached the town of Tumipampa, “ordered water to be brought from a river by boring through a mountain, and making the channel enter the city by curves in this way:” [Illustration.] Figure 46.