Note 7 — MEXICAN COPPER TOOLS.
Stephen Salisbury translation
Those who wish to be more extensively instructed in the Mexican system of numeration can read: Leon y Gama, Descripcion Hist. y Cronol. de las dos Piedras, Parte II., Appendice II., page 128, Edit. C. M. de Bustamante, Mexico, 1832. Clavigero, Storia antica di Messico, English translation by Ch. Cullen, London, 1807, Vol. I., Book 4, pag. 410; and an article recently published by Orozco y Berra, in Tom. I., Entrega 6ma of the Anales del Museo Nacional de Mexico, 1879, page 258, which article is the most complete hitherto written on the subject, and is illustrated by 53 cuts.