IOWA ACADEMY OF SCIENCE 
7 
NECROLOGY. 
MR. W. N. CRAVEN. 
Mr. W. N. Craven, an Associate Member of the Iowa Academy of Sciences, 
was born near Indianola, Iowa, December 24, 1868. He was graduated from 
Simpson College in 1901. After three years of teaching in Iowa he was obliged 
by failing health to remove to Canon City, Colorado, where he resided till the 
time of his death, April 26, 1909. 
In 1903 Mr. Craven presented the accompanying thesis in connection with 
work at Simpson College. It was his intention' at the time to present the 
paper at a university later as an evidence of previous work when seeking 
admission to a graduate school, but his failing health soon necessitated a change 
in plans. His paper is now presented to the Academy partly in recognition of 
the quality of his work and partly that the results of his work may be of use 
to other students of biology. In the death of Mr. Craven Iowa has lost a young 
man whose marked ability, energy and purpose, gave promise of a useful 
scientific career. 
John L. Tilton. 
