Two of the prominent authorities on whom I have relied in this Introductory portion of the work, are Juan de Sarmiento and the Licentiate Ondegardo. Of the former I have been able to collect no information beyond what is afforded by his own writings. In the title prefixed to his manuscript, he is styled President of the Council of the Indies, a post of high authority, which infers a weight of character in the party, and means of information, that entitle his opinions on colonial topics to great deference. These means of information were much enlarged by Sarmiento's visit to the colonies, during the administration of Gasca. Having conceived the design of compiling a history of the ancient Peruvian institutions, he visited Cuzco, as he tells us, in 1550, and there drew from the natives themselves the materials for his narrative. His position gave him access to the most authentic sources of knowledge, and from the lips of the Inca nobles, the best instructed of the conquered race, he gathered the traditions of their national history and institutions. The quipus formed, as we have seen, an imperfect system of mnemonics, requiring constant attention, and much inferior to the Mexican hieroglyphics. It was only by diligent instruction that they were made available to historical purposes; and this instruction was so far neglected after the Conquest, that the ancient annals of the country would have perished with the generation which was the sole depositary of them, had it not been for the efforts of a few intelligent scholars, like Sarmiento, who saw the importance, at this critical period, of cultivating an intercourse with the natives, and drawing from them their hidden stores of information. To give still further authenticity to his work, Sarmiento travelled over the country, examined the principal objects of interest with his own eyes, and thus verified the accounts of the natives as far as possible by personal observation. The result of these labors was his work entitled, "Relacion de la sucesion y govierno de las Yngas Senores naturales que fueron de las Provincias del Peru y otras cosas tocantes a aquel Reyno, para el Iltmo. Senor Dn Juan Sarmiento, Presidente del Consejo R1 de Indias."