BULI.KTIK 



OF THE 



Scientific Laboratories 



OF 



DENISON UNIVERSITY. 



VOL. VI . PART I. 



WITH SEVEN PLATES. 



EDITED BY 



W. G. TIGHT, M. S , 

 Department of Geology and Natural History. 



COKTEKTS : 



PAGE 



Editor's Statement 3 



List of Universities, Societies, etc., with which the Bulletin Exchanges 4 



Some Observations on the Crushing Effects of the Glacial Ice Sheet. 



Plates A to D. W. G. Tight 12 



Biological Notes upon Fiber, Gcomys and Erethyzon. 



C. L. and C. Judson Herrick 15 



Studies in the Topography of the Rodent Brain : Erethizon Dorsatus and 



and Geomys Bursarius. Plates I to III. C. judson Herrick 26 



Meteorological Observations at Granville 47 



GRANVILLE, OHIO, MAY, 1891. \ 



