[35] _C. W. Severinghaus. Unpublished data_.
[Illustration: _Figure 14.--Arthritis in right hind foot of specimen
M-28. (Photo courtesy of University of Minnesota Veterinary Diagnostic
Laboratory.)_]
[Illustration: _Figure 15.--Infection and fibrous mass in a front foot
of specimen M-29. (Photo courtesy of University of Minnesota Veterinary
Diagnostic Laboratory.)_]
[Illustration: _Figure 16.--Injury to left front foot of specimen
M-196. (Photo courtesy of L. D. Mech)._]
[Illustration: _Figure 17.--Healed fracture of left hind leg of
specimen M-227. (Photo courtesy of University of Minnesota Veterinary
Diagnostic Laboratory.)_]