BIIIxIaHTIK 
OF THE 
OF - 
DENISON UNIVERSITY. 
WL. VI, PART I 
WITH; SEVEN .PLATES. 
. - EDITED BY ' 
. ' W: G. TIGHT.; M. S., . . 
. Department of. Geology and , Natural History, 
^ CONTENTS': 
. ' ■ - ' -■ 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 Ipe Sheet. 
; ..Plates' A to T). - W. G. Tight ■ .i 2 , 
-Biological- Notes^upori Fibei> Geomys and. Erethyzon. ! 
C. L'. and .Ci. Tudson Herrick.,...,.., - 
Stnjdies in the Topography of the Rodent Braiii : Erethizon. Dorsatus and 
, and Geomys/Bursariu^. PlatesT to III.. C. Judson Herrick—— _ ,26 
Meteorological Obserymions at Gramdlie- — „ 47 
-iGRANVILLE, OHIO, MAY, 1891. 
