The horns are quite small, but the curve is well defined, and they
distinctly mark the sex of the individual, even at the beginning of the
third year.

+------------------------------------------------------------+
| BISON AMERICANUS. |
|(Young cow, in third year. Taken October 14, 1886. Montana.)|
+------------------------------------------------------------+
| (_No. 15686, National Museum collection._) |
+------------------------------------------------------------+
| |Feet.| Inches. |
|Height at shoulders | 4 | 5 |
|Length, head and body to insertion of tail| 7 | 7 |
|Depth of chest | 2 | 4 |
|Depth of flank | 1 | 4 |
|Girth behind fore leg | 5 | 4 |
|From base of horns around end of nose | 2 | 81/2 |
|Length of tail vertebræ | 1 | .. |
+------------------------------------------------------------+

9. _The adult Cow._--The upper body color of the adult cow in the
National Museum group (see Plate) is a rich, though not intense, Vandyke
brown, shading imperceptibly down the sides into black, which spreads
over the entire under parts and inside of the thighs. The hair on the
lower joints of the leg is in turn lighter, being about the same shade
as that on the loins. The fore-arm is concealed in a mass of almost
black hair, which gradually shades lighter from the elbow upward and
along the whole region of the humerus. On the shoulder itself the hair
is pale yellow or straw-color (Naples yellow + yellow ocher), which
extends down in a point toward the elbow. From the back of the head a