AN ESSAY 



TO WHICH WAS AWARDED 



.THE SECOND PRIZE OF THE BOYLSTON MEDICAL 

 SOCIETY FOR 1867. 



BY F. R. STURGIS, 



HOUSE SURGEON OF THE MASSACHUSETTS GENERAL HOSPITAL. 



SEGES VOTIS RESP'ONDET." 



f rinteir for % 



CAMBRIDGE : 



PRESS OF JOHN WILSON & SON. 

 1867. 



