REVIEWS 827 
parallel to it from Danzig to Stettin, and thence vza the Trebel to the 
Baltic near Ribnitz. Some parts of this marginal water course were 
fluviatile and some lacustrine, the largest lake being about Stettin. 
These lakes are described in detail. For the largest three distinct 
levels are made out, the highest of which is 25 meters above sea level. 
These stages are connected with the retreat of the ice, and the open- 
ing of new outlets. The development of the present Baltic drainage 
is described in great detail. Many of the north-south valley now 
draining to the Baltic are thought to have been originally subglacial 
valleys draining south to the marginal valley last mentioned before 
the ice melted away. The drainage through them was then reversed. 
Between the fourth halting place of the ice and the Baltic Sea 
Keilhack makes out and maps eleven substages in the recession of the 
ice, each changing in some recognizable way, the drainage of the pre- 
ceding stage. These subordinate stages, like the larger ones, show 
that the ice did not retreat at the same rate all along its front. So 
detailed a piece of work concerning drainage along the margin of the 
ice has not before been published. 
One of the interesting facts brought out in this paper is the simi- 
larity of the phenomena of the last glacial epoch in Germany with 
those of the corresponding epoch in the United States. In the Wis- 
consin epoch the edge of the ice made several halts in its recession 
from its position of maximum advance. In each of these positions 
morainic belts were developed, and as in Germany the strongest of 
these belts was not at the position of maximum advance, but in a more 
northerly position. As in Germany, each morainic belt is bordered by 
sand plains. As in Germany, the recession of the edge was unequal, 
and here as there, the lobations of one stage did not correspond with 
those of another. The analogies might be carried much further, but 
not to the drainage from the ice, since similar topographic relations 
did not exist in the United States. 
Reb: 
Shore Line Topography. By ¥F. P. Guiiiver.. Proc. Am. Acad. 
of Arts and Sciences, Jan. 1899. pp. 151-258. 
In this essay Mr. Gulliver presents the mature results of a very 
serious piece of work. The topography of shore lines is considered 
under zzztzal forms and seguential forms. Under initial forms are 
