[49] Humboldt mentions a cutting-instrument found near Cuzco, which was composed of 0.94 parts of copper and 0.06 of tin. The latter metal is scarcely ever found in South America, but I believe there are traces of it in parts of Bolivia. In some of the instruments silica was substituted for tin.
[51] It has been stated that the ancient Peruvian buildings had no windows. This is a mistake. Amongst other instances I may mention the occurrence of one in the palace of the Colcampata, at Cuzco.
[53] The year, called huata, was divided into the following twelve moons or months (quilla). It commenced at the summer solstice on the 22nd of December with the month of
1. Raymi or December.
2. Huchuy Poccoy or January, when the corn begins to ripen.
3. Hatun Poccoy or February, when the ripeness of the corn increases.
4. Paccari Huañuy and Paucar Huaray or March.
5. Arihua or April.