MAN AND APE COMPARED 5 



About half-way from the centre to the edge, along 

 each side, is a row of four round holes. Across the 

 surface of the bone is a dim transverse line between 

 each pair of holes, from which it appears that five 

 smaller sections of the column have anchylosed or 

 grown into each other to form the sacrum, and the 

 holes coincide with the open spaces between the 

 lateral processes of the other bones of the column 

 above. 



In the chimpanzee, this bone has the same general 

 form as in man, but instead of four holes in each 

 row it has five, connected by transverse lines in the 

 same way, indicating that six of the segments are 

 united instead of five ; but to compensate for this 

 the ape has one vertebra less in the section of the 

 column just above it, in that portion called the 



