HUMAN 

 P H Y S I L O G Y 



BY 



PROFESSOR LUIGI LUCIANI 



DIRECTOR OF THC PHYSIOLOGICAL [NSTITUTE OF I'lIK I'.OVAI. rxiVKKsnv <>F ROME 



TRANSLATED BY 



FRANCES A. WELBY 



WITH A PREFACE BY 



J. N. L ANGLE Y, F.R.S. 



I'llol KSSOK nr 1'IIYSIOLOGY IN THE UXIVF.RSITY OF CAMBRII:F. 



IN FIVE VOLUMES 

 VOL. IV 



EDITED BY 



GORDON M. HOLMES, 

 THE SENSE ORGANS 



MACMILLAN AND CO., LIMITED 

 ST. MARTIN'S STIIEET, LONDON 



1917 



