Note 203 — Chapter IV · MEXICAN HIEROGLYPHICS—MANUSCRIPTS—ARITHMETIC—CHRONOLOGY—ASTRONOMY

In his second treatise on the cylindrical stone, Gama dwells more at large on its scientific construction, as a vertical sun-dial, in order to dispel the doubts of some sturdy skeptics on this point. (Descripcion, Parte 2, Apend. 1.) The civil day was distributed by the Mexicans into sixteen parts, and began, like that of most of the Asiatic nations, with sunrise. M. de Humboldt, who probably never saw Gama’s second treatise, allows only eight intervals. Vues des Cordillères, p. 128.