The only instance which, on a proper comparison, will probably be adduced to prove the incorrectness of these views, will be that of a few tribes of American Indians, who, though they have extremely robust bodies, are eaters of much flesh. But they live also in the open air, and have many other good habits, and are healthy in spite of the inferiority of their diet. But perfect, physically, as they seem to be, and probably are, examine the vegetable-eaters among them, of the same tribe, and they will be found still more so. In the next place, the fluids are all in a better and more healthy state. In proof of this, I might mention in the first place that superior agility, ease of motion, speed, and power of endurance which so distinguish vegetable-eaters, wherever a fair comparison is instituted. They possess a suppleness like that of youth, even long after what is called the juvenile period of life is passed over. They are often seen running and jumping, unless restrained by the arbitrary customs of society, in very advanced age. Their wounds heal with astonishing rapidity in as many days as weeks, or even months, in the latter case. All this could not happen, were there not a good state of the fluids of the system conjoined, to a happy state of the solids. The vegetable-eater, if temperate in the use of his vegetables, and if all his other habits are good, will endure, better than the flesh-eater, the extremes of heat and cold. This power of endurance has ever been allowed to be a sure sign of a good state of health. The most vigorous man, as it is well known, will endure best both extremes of temperature. But it is a proof also of the greater purity of his solids and fluids.