The like course was pursued with reference to the other requisitions of the government. All the mines in the kingdom belonged to the Inca. They were wrought exclusively for his benefit, by persons familiar with this service, and selected from the districts where the mines were situated. *23 Every Peruvian of the lower class was a husbandman, and, with the exception of those already specified, was expected to provide for his own support by the cultivation of his land. A small portion of the community, however, was instructed in mechanical arts; some of them of the more elegant kind, subservient to the purposes of luxury and ornament. The demand for these was chiefly limited to the sovereign and his Court; but the labor of a larger number of hands was exacted for the execution of the great public works which covered the land. The nature and amount of the services required were all determined at Cuzco by commissioners well instructed in the resources of the country, and in the character of the inhabitants of different provinces. *24 [Footnote 23: Garcilasso would have us believe that the Inca was indebted to the curacas for his gold and silver, which were furnished by the great vassals as presents. (Com. Real., Parte 1, lib. 5, cap. 7.) This improbable statement is contradicted by the Report of the Royal Audience, Ms., by Sarmiento, (Relacion, Ms., cap. 15,) and by Ondegardo, (Rel. Prim., Ms.) who all speak of the mines as the property of the government, and wrought exclusively for its benefit. From this reservoir the proceeds were liberally dispensed in the form of presents among the great lords, and still more for the embellishment of the temples.] [Footnote 24: Garcilasso, Com. Real., Parte 1, lib. 5, cap. 13 - 16. - Ondegardo, Rel. Prim. et Seg., Mss.] This information was obtained by an admirable regulation, which has scarcely a counterpart in the annals of a semi-civilized people. A register was kept of all the births and deaths throughout the country, and exact returns of the actual population were made to government every year, by means of the quipus, a curious invention, which will be explained hereafter. *25 At certain intervals, also, a general survey of the country was made, exhibiting a complete view of the character of the soil, its fertility, the nature of its products, both agricultural and mineral, - in short, of all that constituted the physical resources of the empire. *26 Furnished with these statistical details, it was easy for the government, after determining the amount of requisitions, to distribute the work among the respective provinces best qualified to execute it. The task of apportioning the labor was assigned to the local authorities, and great care was taken that it should be done in such a manner, that, while the most competent hands were selected, it should not fall disproportionately heavy on any. *27