lEiAB 96 19C' 



Volume XIII ^IT^f '• 



BULLETIN 



OF THE 



SCIENTIFIC LABORATORIES 



OF 



DENISON UNIVERSITY 



EDITED BY 



CLARK W. CHAMBERLAIN, 



Permanent Secretary Denison Scientijic Association. 



CLARENCE LUTHER HERRICK 



Granville, Onio, January, 1905. 



