HUMAN 

 PHYSIOLOGY 



BY 



PROFESSOR LUIGI LUCIANI 



DIRECTOR OF THE PHYSIOLOGICAL INSTITUTE OF THE ROYAL UNIVERSITY OF ROME 



TRANSLATED BY 



FRANCES A. WELBY 



WITH A PREFACE BY 



J. N. LANG LEY, F.RS. 



PROFESSOR OF PHYSIOLOGY IN THE UNIVERSITY OF CAMBRIDGE 



IN FIVE VOLUMES 

 VOL. IV 



EDITED BY 



GORDON M. HOLMES, M.D. 

 THE SENSE ORGANS 



MACMILLAN AND CO., LIMITED 

 ST. MARTIN'S STREET, LONDON 



1917 



