547 On the Effect of Impacts, ete. [July, 
down-looking bone; ¢. g., the lateral grooves of the distal end of 
the tibia. (4) When the inferior bones are the denser, the 
superior articular face yields; ¢. g., the distal end of the radius to 
the first row of carpals (Fig. 11). 
(5) The metapodial keels commence in the lower types on the- 
posterior side of the distal extremity of the bone. This is partly 
due to the presence there of a pair of sesamoid bones, which with 
the tendons in which they are developed, sustain and press on 
the lateral parts of the extremities, and leave the middle line 
without support. 
Published June 27, 1881. 
e 
