OUR ANCIENT RELATIVES 



evolution of the teeth, jaws, braincase, middle 

 and inner ear, vertebral column, pelvis, hands 

 and feet. 



Meanwhile Elliot Smith, Tilney, Hunter, Le Gros 

 Clark and others have shown how the existing 

 tree-shrews, lemurs, monkeys, apes and man pre- 

 sent a progressive series in the evolution of the 

 brain as a whole and of the various nuclei and 

 centers controlling bodily functions and be- 

 havior. 



Sir Arthur Keith and others have also traced 

 step by step the structural adjustments in the 

 diaphragm, abdomen and pelvic floor, as the 

 originally horizontal body assumes a sitting po- 

 sition or moves erect as in the gibbon and 

 man. 



It is remarkable how completely the results of 

 the students of the nervous system and of the 

 anatomy of the viscera accord with studies on the 

 evolution of the teeth, skull, limbs, etc., and on 

 the classification and fossil history of the families 

 and genera of Primates. 



Taken together, these results afford cumulative 



evidence for the conclusions that man still hears in 



his whole organization an indelible stamp of the 



63 



