On the continent, especially toward the north, the natives were of robust and vigorous constitution. Their sole employment was the chase of the numerous wild animals of the forest and prairies: from their continual activity, their frame acquired firmness and strength;[235] but in the islands, where game was rare, and the earth supplied spontaneously an abundant subsistence, the Indians were comparatively feeble, being neither inured to the exertions of the chase nor the labors of cultivation. Generally, the Americans were more remarkable for agility than strength, and are said to have been more like beasts of prey than animals formed for labor. Toil was hateful, and even destructive to them; they broke down and perished under tasks that would not have wearied a European. Experience proves that the physical strength of civilized man exceeds that of the savage.[236] Hand to hand in war, in wrestling, leaping, and even in running for a short distance, this superiority usually appears. In a long journey, however, the endurance of the Indian has no parallel among Europeans. A Red Man has been known to travel nearly eighty miles between sunrise and sunset, without apparent fatigue. He performs a long journey, bearing a heavy burden, and indulging in no refreshment or repose; an enemy can not escape his persevering pursuit, even when mounted on a strong horse. It has been already observed that the Americans are rarely or never deformed, or defective in their senses, while in their wild state, but in those districts where the restraints of law are felt, an extraordinary number of blind, deaf, dwarfs, and cripples, are observed. The terrible custom among the savage tribes of destroying those children who do not promise a vigorous growth, accounts for this apparent anomaly. Infancy is so long and helpless that it weighs as a heavy burden upon a wandering people; food is scanty and uncertain of supply, hunters and their families must range over extensive countries, and often remove from place to place. Judging that children of feeble or defective formation are not likely to survive the hardships of this errant life, they destroy all such unpromising offspring,[237] or desert them to a slower and more dreadful fate. The lot of all is so hard that few born with any great constitutional defect could long survive, and arrive at maturity.