120 REVIEWS 
9). Interglacial sedimentary deposits with arctic and boreal fauna 
and flora. Older Dryas-clay in Skane and Denmark. 
10). Morainic deposits from the second Baltic ice-current over the 
lower tracts of Skane, the Danish Islands, the east coast of Jutland, and 
the north coast of Germany. 
11). Late glacial sedimentary deposits with arctic fauna and flora, 
perhaps partly of the same age as the preceding. The latest Yoldia- 
clay in Vendsyssel, Sweden and Norway. Latest Dryas-clay in Skane, 
Denmark, and northern Germany. 
12). Late glacial sedimentary deposits with boreal fauna and flora. 
Glacial shell-beds in Sweden and Norway, Zirphzea-bed in Vendsyssel. 
‘“‘ This classification of the diluvial deposits,” the author says, ‘‘is 
only a hypothesis, but it appears to me that it better than those in 
use heretofore explains the many intricate relations of the drift, 
and that it will serve better than these as a working hypothesis in geol- 
gical investigations on the diluvial deposits of Denmark. It hardly 
rests On any more uncertain foundation than the hypothesis in vogue 
at the present time, and like all these it is very much in need of verifi- 
‘cation.’”’ The first ice period in Geikie’s classification, that represented 
by the Weyburn crag, is set aside expressly, and so is also Geikie’s fifth 
glacial period. The Norway ice-current is believed to have been older 
than the oldest Baltic ice-current, and the opinion is expressed that 
the time of the former was separated from that of the latter by an inter- 
glacial period, during which the ice left the land entirely. The evi- 
dence adduced in favor of this view is the presence of Norwegian 
ibowlders in the lowest moraines in Denmark, and in the drift which 
lies south of the southern border of the Baltic moraine in northern 
Europe. It is not considered as probable that the Norway current 
could have been diverted by the Baltic current to such an extent in the 
same glacial period, as to have first deposited its material in northern 
Denmark, and later on in the same age have laid down its moraine in 
England. 
The author urges the importance of the study of the fossils of the 
drift. The greater part of the paper gives the results of his studies of 
the foraminifera in the drift of Denmark. These fossils are small 
and have often been well preserved, where larger fossils have been 
crushed. ‘These organisms are marine, and when found, they often 
give decisive evidence as to the circumstances of their deposition, 
for many of them are dependent on certain conditions of climate and 
