We will not enter into a discussion of feather mosaics at this time, but will consider primarily the parallel art of turquois mosaic. Aside from the numerous historical notices contained in the early chronicles and in the inventories of the loot of the Aztecs sent to Europe by Cortés, there is little of this art upon which to base a careful study that has survived. It is one of the most interesting and highly developed arts of ancient America, but it was practised by only a few tribes. Apart from the Mexican region where turquois mosaic was most highly developed, excellent examples have been found with other ancient remains of the Pueblos of Arizona and New Mexico, and incrusted objects have also been found with ancient burials on the coast of Peru, indicating a somewhat similar technique though far less skill in application. The materials usually employed in Mexico were turquois, jadeite, malachite, quartz, beryl, garnet, obsidian, marcasite, gold, bits of red and other colored shell, and nacre. The base upon which the incrustation was laid was wood, stone, gold, shell, pottery, and possibly leather and native paper, the mosaic being held in place by means of a tenacious vegetal pitch or gum, or a kind of cement. EARLIEST HISTORICAL ACCOUNTS OF TURQUOIS MOSAIC IN MEXICO THE GRIJALVA EXPEDITION, 1518 The first knowledge received by Europeans of the existence of turquois mosaic objects among the Mexicans was by members of the expedition sent out from Cuba by the governor, Diego Velásquez, during the spring of 1518, under the command of Juan de Grijalva. After reaching the shores of Yucatan near the island of Cozumel, the party coasted the Yucatan peninsula, reaching the territory of the present State of Campeche, which had been discovered the previous year by Francisco Hernández de Córdoba. Proceeding westward along unknown lands, they reached a great river in the State of Tabasco, to which the name of the commandant was given, and it is still known as Rio de Grijalva. Here, according to some accounts, the expedition obtained the first specimens of turquois mosaic. We shall consider this point later. Leaving the Rio de Grijalva they went westward and arrived at the site of the present city of Vera Cruz, where they obtained by barter with the Indians a considerable treasure, including some objects of turquois mosaic, which Grijalva decided to send immediately to the governor in Cuba with a report of his discoveries up to that time. Consequently, on June 24, 1518, one of Grijalva’s captains, Pedro de Alvarado, set out on the return voyage to Fernandina (Cuba), while Grijalva himself continued the exploration of the eastern coast of Mexico.