With this advancement in agricultural science, the Peruvians might be supposed to have had some knowledge of the plough, in such general use among the primitive nations of the eastern continent. But they had neither the iron ploughshare of the Old World, nor had they animals for draught, which, indeed, were nowhere found in the New. The instrument which they used was a strong, sharp-pointed stake, traversed by a horizontal piece, ten or twelve inches from the point, on which the ploughman might set his foot and force it into the ground. Six or eight strong men were attached by ropes to the stake, and dragged it forcibly along, - pulling together, and keeping time as they moved by chanting their national songs, in which they were accompanied by the women who followed in their train, to break up the sods with their rakes. The mellow soil offered slight resistance; and the laborer, by long practice, acquired a dexterity which enabled him to turn up the ground to the requisite depth with astonishing facility. This substitute for the plough was but a clumsy contrivance; yet it is curious as the only specimen of the kind among the American aborigines, and was perhaps not much inferior to the wooden instrument introduced in its stead by the European conquerors. *25 [Footnote 25: Ibid., Parte 1, lib. 5, cap. 2.] It was frequently the policy of the Incas, after providing a deserted tract with the means for irrigation, and thus fitting it for the labors of the husbandman, to transplant there a colony of mitimaes, who brought it under cultivation by raising the crops best suited to the soil. While the peculiar character and capacity of the lands were thus consulted, a means of exchange of the different products was afforded to the neighbouring provinces, which, from the formation of the country, varied much more than usual within the same limits. To facilitate these agricultural exchanges, fairs were instituted, which took place three times a month in some of the most populous places, where, as money was unknown, a rude kind of commerce was kept up by the barter of their respective products. These fairs afforded so many holidays for the relaxation of the industrious laborer. *26 [Footnote 26: Sarmiento, Relacion, Ms., cap. 19. - Garcilasso, Com. Real, Parte 1, lib. 6, cap. 36; lib. 7, cap. 1. - Herrera, Hist. General. dec. 5, lib. 4, cap. 3.]