436 J. Croll—Examination of Wallace's Modification of the 
‘close association with glacial conditions must be held to bea 
strong corroborative argument in favor of the reality of an 
” 
tion of the Upper Till of Scotland. , 
he position of these Hessle beds to which Mr. Wallace: 
prior to the last great extension of the iée) in all pe 
and Ireland. Interglacial beds belonging to the same period 
have been found in Switzerland, Italy, Denmark, North 
America, and other places, all indicating a mild and equable ona 
