Fic. 1.— Symmetrical sesamoiditis. A, Metacarpus; B, Suffraginis; C, Sesamoids. 
I. x, 2, 4, Erosions of articular cartilage, with darkened background. 3, Repaired fissure of 
the head of rst phalanx. 
II. 5, 5, Erosions apparently from friction. 6, 7, Erosions with dark background. 8, 8, Ex- 
ostoses on sesamoid bone. 
