Rhciiiiiatoid Arthritis in Lansing Man. — Parker. 41 
the knee, is an area 2 cm. long and extending practically the 
width of the condyle showing the typical eburnation of rheu- 
matoid arthritis with the characteristic striae extending antero- 
posteriorly in the direction of motion and attrition. The striae 
average a little more than a millimetre apart, and are reciprocal 
with similar ones on the upper surface of the tibia, the slight 
elevations of one fitting into the corresponding depressions of 
the other. They are distinctly shown in the accompanying 
photograph. The articular surface and margin of the internal 
condyle show no pathological changes. 
The outer tuberosity of the tibia shows a reflected flange 
of bone one cm. wide at its posterior part and apparently less 
developed near the front, although its incomplete condition 
there does not admit of a positive statement of its previous 
condition. A small tubercular excrescence is also developed on 
the outer tubercle of the spinous process (tuberculum inter- 
