When pressed by hunger, the buffalo used to browse on certain species of sage-brush, particularly _Atriplex canescens_ of the Southwest. But he was discriminating in the matter of diet, and as far as can be ascertained he was never known to eat the famous and much-dreaded "loco" weed (_Astragalus molissimus_), which to ruminant animals is a veritable drug of madness. Domestic cattle and horses often eat this plant; where it is abundant, and become demented in consequence. VII. MENTAL CAPACITY AND DISPOSITION. (1) _Reasoning from cause to effect._--The buffalo of the past was an animal of a rather low order of intelligence, and his dullness of intellect was one of the important factors in his phenomenally swift extermination. He was provokingly slow in comprehending the existence and nature of the dangers that threatened his life, and, like the stupid brute that he was, would very often stand quietly and see two or three score, or even a hundred, of his relatives and companions shot down before his eyes, with no other feeling than one of stupid wonder and curiosity. Neither the noise nor smoke of the still-hunter's rifle, the falling, struggling, nor the final death of his companions conveyed to his mind the idea of a danger to be fled from, and so the herd stood still and allowed the still-hunter to slaughter its members at will. Like the Indian, and many white men also, the buffalo seemed to feel that their number was so great it could never be sensibly diminished. The presence of such a great multitude gave to each of its individuals a feeling of security and mutual support that is very generally found in animals who congregate in great herds. The time was when a band of elk would stand stupidly and wait for its members to be shot down one after another; but it is believed that this was due more to panic than to a lack of comprehension of danger. The fur seals who cover the "hauling grounds" of St. Paul and St. George Islands, Alaska, in countless thousands, have even less sense of danger and less comprehension of the slaughter of thousands of their kind, which takes place daily, than had the bison. They allow themselves to be herded and driven off landwards from the hauling-ground for half a mile to the killing-ground, and, finally, with most cheerful indifference, permit the Aleuts to club their brains out.