Immediately around the nose and mouth the hair is very short, straight and stiff, and lies close to the skin, which leaves the nostrils and lips fully exposed. The front part of the chin is similarly clad, and its form is perfectly flat, due to the habit of the animal in feeding upon the short, crisp buffalo grass, in the course of which the chin is pressed flat against the ground. The end of the muzzle is very massive, measuring 2 feet 2 inches in circumference just back of the nostrils. The hair of the chin-beard is coarse, perfectly straight, jet black, and 111/2 inches in length on our old bull. Occasionally a bull is met with who is a genuine Esau amongst his kind. I once saw a bull, of medium size but fully adult, whose hair was a wonder to behold. I have now in my possession a small lock of hair which I plucked from his forehead, and its length is 221/2 inches. His horns were entirely concealed by the immense mass of long hair that nature had piled upon his head, and his beard was as luxuriant as his frontlet. [Illustration: BULL BUFFALO IN NATIONAL MUSEUM GROUP. Drawn by Ernest E. Thompson.] The nostril opening is large and wide. The color of the hairless portions of the nose and mouth is shiny Vandyke brown and black, with a strong tinge of bluish-purple, but this latter tint is not noticeable save upon close examination, and the eyelid is the same. The iris is of an irregular pear-shaped outline, 1-5/16 inches in its longest diameter, very dark, reddish brown in color, with a black edging all around it. Ordinarily no portion of the white eyeball is visible, but the broad black band surrounding the iris, and a corner patch of white, is frequently shown by the turning of the eye. The tongue is bluish purple, as are the lips inside. The hoofs and horns are, in reality, jet black throughout, but the horn often has at the base a scaly, dead appearance on the outside, and as the wrinkles around the base increase with age and scale up and gather dirt, that part looks gray. The horns of bulls taken in their prime are smooth, glossy black, and even look as if they had been half polished with oil. As the bull increases in age, the outer layers of the horn begin to break off at the tip and pile up one upon another, until the horn has become a thick, blunt stub, with only the tip of what was once a neat and shapely point showing at the end. The bull is then known as a "stub-horn," and his horns increase in roughness and unsightliness as he grows older. From long rubbing on the earth, the outer curve of each horn is gradually worn flat, which still further mars its symmetry.