teeth, and also the oldest horns I have seen, I am of the opinion that
the natural life time of the bison is about twenty-five years; certainly
no less.

+--------------------------------------------------------+
| BISON AMERICANUS. |
| (Male, eleven years old. |
| Taken December 6, 1866. Montana.) |
| (_No. 15703, National Museum collection._) |
+--------------------------------------------------------+
| |Feet.|Inches.|
|Height at shoulders to the skin | 5 | 8 |
|Height at shoulders to top of hair | 6 | -- |
|Length, head and body to insertion of tail| 10 | 2 |
|Depth of chest | 3 | 10 |
|Depth of flank | 2 | 0 |
|Girth behind fore leg | 8 | 4 |
|From base of horns around end of nose | 3 | 6 |
|Length of tail vertebræ | 1 | 3 |
|Circumference of muzzle back of nostrils | 2 | 2 |
+--------------------------------------------------------+

8. _The Cow in the third year._--The young cow of course possesses the
same youthful appearance already referred to as characterizing the
"spike" bull. The hair on the shoulders has begun to take on the light
straw-color, and has by this time attained a length which causes it to
arrange itself in tufts, or locks. The body colors have grown darker,
and reached their permanent tone. Of course the hair on the head has by
no means attained its full length, and the head is not at all handsome.