NICHOLAS SENN. 233 



Joseph's Hospital and Presbyterian Hospital, Chicago; and 

 Surgeon to the Passavant and Polyclinic Hospital. 



He was always deeply interested in military matters and 

 military surgery. He was made Surgeon-General of Wiscon- 

 sin in 1888 and retained the position until he left that State. In 

 1892 he was commissioned by Governor Altgeld Surgeon- 

 General of Illinois and retained this position until his death. 



At the outbreak of the Spanish-American War he assumed 

 charge of the mobilization camp at Springfield and ably directed 

 the physical examination of recruits. He was commissioned 

 Lieutenant-Colonel and chief Surgeon, U. S. Volunteers, May 

 13, 1898, and was assigned to duty with the Sixth Army Corps. 

 He went with the expedition under command of Brigadier- 

 General Guy V. Henry, U. S. Volunteers, to Santiago, Cuba, 

 and was assigned to duty as chief surgeon of the operating staff 

 with troops in the field. He resigned September 6, and was 

 honorably discharged September 17. In general orders from 

 the Adjutant-General's office, dated February 13, 1900, Lieu- 

 tenant-Colonel Senn was commended for his surgical work 

 during the Cuban campaign and for making a scientific study 

 of typhoid fever among the troops. 



His work as a teacher of medicine began in 1884 when he 

 was appointed Professor of the Principles and Practice of 

 Surgery in the College of Physicians and Surgeons, Chicago. 

 Four years later he became Professor of the Principles of Sur- 

 gery and Surgical Pathology in the Rush Medical College, and 

 later Professor of Military Surgery in the University of Chicago. 

 He was also Professor of Surgery in the Chicago Polyclinic. 



His lectures always without notes were eloquent, dram- 

 atic and attractive. 



His contributions to American medical literature comprised 

 something over three hundred titles, twelve of these being 

 printed volumes, varying in size, but all of them replete with 

 original matter. Many of them are used as text-books and 

 standard works of reference in most American medical schools, 

 and a good number have been translated into foreign languages. 

 Chief among them may be mentioned his text-books on : " The 

 Principles of Surgery," " Surgical Bacteriology," " Experi- 



