Vita. 



I, ERWIN ELLIS NELSON, was born June 11, 1891, in Spring- 

 field, Missouri, the first child of my parents, Harry Anderson 

 Nelson and Jennie Ellis Nelson. I received my early education 

 in Springfield, graduating from the Springfield High School in 

 1909. The same year I entered Drury College, where I was a 

 student until 1912, taking the premedical group of studies. The 

 following year I was Instructor in Science in the Southern Col- 

 legiate Institute at Albion, Illinois. In 1913 I entered the Uni- 

 versity of Missouri as a senior in the College of Arts and a first 

 year student in the School of Medicine. I received the degree of 

 Bachelor of Arts from the University of Missouri in 1914 and in 

 the same year the degree of Bachelor of Science from Drury 

 College. In February 1914 I was appointed Assistant in Zoology 

 in the University of Missouri, which position I held until June 

 1916. From 1914 to 1918 I was enrolled in the Graduate School 

 of the University of Missouri, and for most of this time also in 

 the School of Medicine. I was granted the degree of Master of 

 Arts in 1916, my major being Zoology. From 1916 to 1918 I was 

 University Fellow in Physiology, resigning in the second semester 

 to become Assistant in Physiology. During the year 1918-19 1 was 

 a junior in Johns Hopkins Medical School. In 1919 I was ap- 

 pointed Assistant Professor of Pharmacology in the University 

 of Michigan School of Medicine, which position I now hold. In 

 1920 I passed the examinations for the degree of Doctor of Phi- 

 losophy at the University of Missouri. 



