Fic, III. — Longitudinal Section of humerus, shown in Fig, I}. 
A. Approximately normal articular cartilage. 
B. Darkened area in bone, due to intense inflammation, corresponding to the dark areas in Fig. II. 
C, C. Erosions at margin of articular cartilage. 
Fic. 1V.—Spavin. Section through the lower tarsal row and metatarsus showing condensing 
ostitis, with marked osteo-sclerosis in tarsal bones. 
