198 
nutrient artery, directed distalwards, and to which a groove leads 
from above, lies just behind the lower end of the articular 
surface that has been described. 
On the antero-internal aspect of the upper expansion of the 
bone an obtusely angulated ridge descends for four inches from 
the corresponding margin of the articular surface. This ridge 
terminates in a roughened convex tuberosity (PI. iv., fig. 2, P). 
The tract between this ridge and the procnemial crest is nearly 
flat, or only very slightly concave in its upper part, where the 
surface is uninjured ; the lower part has suffered some depression 
from injury. 
Above the level of the (lower) fibular articulation the shaft is 
sub-quadrangular in shape, and at the same time somewat antero- 
posteriorly compressed. This latter characteristic continues 
throughout the rest of the shaft, but below the fibular surface 
the sub-quadrangular section becomes more of a pyriform oval, 
the smaller end being external; at the lower end the section 
tends to become again somewhat quadrilateral. The lateral 
width which, at the upper level of the fibular articulation, is 
32 inches, diminishes in the descent to 21 inches at the narrowest 
part of the bone, which is 5 inches above its lower end ; below 
this there is a slight increase of width as the shaft expands into 
the condyles. There is also a slight diminution of the antero- 
posterior diameter of the shaft in passing from above downwards. ' 
At a little above the point at which the bone has been des- 
cribed as narrowest, laterally, there begins a marked deflection 
inwards of the lower end of the shaft, and the inflection 
affects the inner border to a greater extent than the outer. The 
result is to cause a considerable production inwards of the inner 
condyle. There is, at the same time, a slight but marked deflection 
forwards of the lower extremity. These features are shown in the 
whole length figures of the bone. 
Of the lower expansion the inner condyle projects more, both 
anteriorly and posteriorly (Pl. iv., fig. 7), particularly in the 
former direction, than the outer. The whole antero-posterior 
width is also greater than that of the latter, (93 mm. to 73 mm). 
In lateral width the condyles are nearly equal. Held with the 
long axis perfectly vertical, the ectocondyle reaches a slightly 
lower level than its fellow. (Figs. 1, 2).* 
When the two condyles are held at the same horizontal level 
their articular surfaces ascend in front to about the same level, 
but the upward extension of the inner, besides its greater pro- 
minence anteriorly, preserves a more uniform width than that of 
the outer, which latter becomes in its upper part reduced to a 
* In Fig. 6, the axis is not quite vertical. 
