10 UNIVERSITY OF WISCONSIN STUDIES 
had been attracted by the new subject, the new science of 
bacteriology, that was developing so rapidly under the 
tutelage of Pasteur and Koch. ‘The thesis submitted to 
Harvard University in 1884 by Professor Trelease for his 
doctorate was entitled Observations on Several Zooglea and 
Related Forms. It involved a study of the growth of cer- 
tain bacteria on potato. The interest of Professor Trelease 
in bacteriology led him to introduce it into his courses in 
botany. Dr. Trelease left the University in 1885 and his 
work fell to the then professor of zoology, President E. A. 
Birge, under whose guidance the student was to receive his 
introduction to bacteriology. Two years were spent in grad- 
uate study at the University of Wisconsin. During this 
period the first paper was prepared. It was entitled Pre- 
lininary Observations on the Bacteria of Ice from Lake 
Mendota, and was published in 1889. 
In those days two laboratories were attracting all students 
who wished to become bacteriologists, that of Robert Koch 
at the University of Berlin and that of Louis Pasteur in the 
Institute which bears his name. The years of 1890-1891 and 
1891-1892 were spent in these laboratories and at the Zoological 
Station at Naples where the data were collected for the first ex- 
tensive paper which was published in the Zeitschrift fiir Hy- 
quene in 1892 under the title Untersuchungen tiber im Golf von 
Neapel lebende Bakterien. On returning to this country a year 
was spent under Dr. William H. Welch of Johns Hopkins 
University. By this university the doctor’s degree was 
granted in 1893. The thesis submitted for the degree was 
entitled Bacteria in their Relation to Vegetable Tissue. It 
was published in the Johns [Hopkins Hospital Reports in 
1893. <A year was then spent at the University of Chicago 
as fellow in biology. 
Under the influence of Weigmann in Germany, Storch in 
Denmark, and Conn in this country, dairy bacteriology was 
rapidly attracting the attention of those interested in this 
phase of animal industry. It had long been evident to the 
director of the Wisconsin Experiment Station, Professor 
Henry, that Wisconsin was destined to become a great dairy 
