This quick judging of dimly seen distant things, the eye and mind achievement of the mounted barbarian on the unobstructed plains, is not nearly so admirable as that of his fellow-savage in sub-tropical regions overspread with dense vegetation, with animal life in great abundance and variety and where half the attention must be given to species dangerous to man, often very small in size. In some hot humid forest districts, the European who should attempt to hunt or explore with bare feet and legs would be pricked or lacerated at almost every step of his progress, and probably get bitten by a serpent before the day's end. Yet the Indian passes his life there and, naked or half-naked, explores the unknown wilderness of thorns and has only his arrows to provide food for himself and his wife and children. He does not get pierced with thorns and bitten by serpents, because his eye is nicely trained to pick them out in time to save himself. He walks rapidly, but he knows every shade of green, every smooth and crinkled leaf in that dense tangle, full of snares and deceptions, through which he is obliged to walk; and much as leaf resembles leaf, he sets his foot where he can safely set it, or, quickly choosing between two evils, where the prickles and thorns are tenderest, or, for some reason known to him, hurt least. In like manner he distinguishes the coiled-up venomous snake, although it lies so motionless--a habit common to the most deadly kinds--and in its dull imitative colouring is so difficult to be distinguished on the brown earth, and among gray sticks and sere and variegated leaves. A friend of mine, Fontana of Buenos Ayres, who has a life-long acquaintance with the Argentine Indians, expresses the opinion that at the age of twelve years the savage of the Pampas has completed his education and is thereafter able to take care of himself; but that the savage of the Gran Chaco--the sub-tropical Argentine territory bordering on Paraguay and Bolivia,--if left to shift for himself at that age would speedily perish, since he is then only in the middle of his long, difficult and painful apprenticeship. It was curious and pitiful, he says, to see the little Indian children in the Chaco, when their skins were yet tender, stealing away from their mother and trying to follow the larger ones playing at a distance. At every step they would fall and get pricked with thorns or cut with sharp-edged rushes and tangled in the creepers, and hurt and crying they would struggle on and in this painful manner at last learn where to set their feet.