THE ENGINES OF 

 THE HUMAN BODY 



BEING THE SUBSTANCE OF CHRISTMAS 



LECTURES GIVEN AT THE ROYAL INSTITUTION 



OF GREAT BRITAIN, CHRISTMAS 1916-1917 



BY 



ARTHUR KEITH, M.D., LL.D.(Ab dn ),F.R.S. 



CONSERVATOR OF MUSEUM AND HUNTERIAN PROFESSOR, ROYAL COLLEGE 



OF SURGEONS OF ENGLAND ; FULLERIAN PROFESSOR OF PHYSIOLOGY, 



ROYAL INSTITUTION OF GREAT BRITAIN AND IRELAND; PRESIDENT- 



OF THE ANATOMICAL SOCIETY OF GREAT BRITAIN AND IRELAND ; 



FORMERLY PRESIDENT OF THE ROYAL ANTHROPOLOGICAL 



INSTITUTE OF GREAT BRITAIN AND IRELAND 



Author of 



" The Human Body" " The Antiquity of Man" "Human Embryology 



and Morphology" " Menders of the Maimed" etc. 



WITH 2 PLA TES AND 47 FIGURES IN TEXT 



LONDON ^ 



WILLIAMS AND NORGATE 



14 HENRIETTA STREET, COVENT GARDEN, W.C.2 

 1919 



V 





