In the summer the bending of the grass under their feet, tracks in crossing a stream or any marshy place, and in winter, tracks in the snow, will show to a tolerable certainty how many persons and what time they have passed. A slight rain would determine whether the tracks were before or since it fell. Snow would prove the same; the dew of the morning in summer or fall would reveal the time to within 24 hours. The grass nibbled by the horses by its appearance would denote whether the party had passed within a few days and the hardness of the dung of the animals brings the time to a still greater degree of certainty. A correct judgment is not, however, formed by any one of the above criterions, but by a comparison of the whole, and by following the trail, and observing also the carcasses of the animals killed by the party, their number, state of decay, etc. These with other smaller indications, particularly if an arrow or moccasin be lost or thrown away, will determine the number and nation that have passed and the time. The passage of war parties is distinguished from hunting parties of their own people by the absence of boys’ tracks or traces of dog travailles in the former, and by the precautions they take in their encampment. SENSES There is an extreme acuteness in their sense of sight—that is, to see at a glance, over a wide extent of country, sometimes dotted by bushes, ravines, or hills, and distinguish the living objects when at rest from others. There is a great difference in the faculty of seeing far and what is called “picking up an object”—that is, distinguishing it from the inanimate bodies intervening. The Indians possess this power in so remarkable a degree as to appear a kind of instinct. At a distance of 12 or 15 miles they will distinguish animals from timber, even supposing they are not in motion. If moving they will discern between horses and buffalo, elk and horses, antelope and men, a bear and a bull, or a wolf and a deer, etc. But the greatest mystery is how they make out anything living to be there at such a distance, on the instant, when they themselves are in motion and the animal at rest. This they do when it is surrounded by a hundred other objects as like to living creatures as it is. Once pointed out, the movements are watched and its character thus determined. Their powers in this respect are truly astonishing and must be acquired. They also judge very correctly of the relative distances of objects, either by the eye or to each other. Smoke can be seen rising on the plains at a distance of 60 miles, and they will tell from that or any lesser distance within a few miles of the place where it rises. Their ideas of location are fully as remarkable.