172 



THE ROYAL SOCIETY OF CANADA 



AW '. ''*', -'• / 



Imu. to 



-Shows the Heidelberg jaw (above), the Piltdown jaw (in the middle) and 

 a modern jaw (below), all reduced to the same extent in size for purposes of 

 comparison. The distance A B will be found to be exactly the same in 

 the Heidelberg and Piltdown specimens. In the modern jaw this distance 

 Has become shrunken to the extent of the gap A C or the angle A F C F 

 bemg the Fogonion. It will be noticed that the distance along the line 

 AH occupied by the teeth is exactly the same in the Heidelberg jaw and 

 the modern jaw, whereas this distance is nearly half as much again in the 

 riitdown specimen. 



