Editorial Coiiinioit. 123 
diminished, and the general view obstructed. The collections 
in invertebrate paleontology occupy only about one-half the 
space at present desired, and the space devoted to vertebrate 
remains will prove ridiculously insufficient so soon as the work 
now under way of restoring some of the larger remains of Tri- 
ceratops, Stegosaurus etc., is completed. 
The workrooms of the department are at present in a rented 
building, several blocks from the museum, while hundreds of 
boxes of materials from the various surveys are stored in the 
sheds, where not readily accessible. Laboratories and offices 
are too crowded to admit of satisfactory accommodations for 
more than the present force. The entire space at present de- 
voted to exhibition and study installation amounts to a little 
short of 25,000 feet. It is estimated that at the present rate of 
growth 100,000 square feet will be none too much to supply all 
the needs of the department during the next ten years. 
G. p. M. 
REVIEW OF RECENT GEOLOGICAL 
LITERATURE. 
Die Ursachcn dcr Obciflachcngcstaltung dcs Norddcntschcn FlacJi- 
landcs. von Dr. Felix Wahnschaffe. 9 plates and 33 text-illus- 
trations, pp. 258. Second edition, fully revised. Stuttgart. J. 
Engelhorn. igoi. 10 marks. 
Since the inititial examination and publication by Salisbury and 
Wahnschaffe on the moraines bordering the southern Baltic in Ger- 
many, the glacial geology of Germany has received much more attention 
than ever before, and especially by Dr. Wahnschaffe. In this volume 
(which would be much improved liy the addition of an index) the 
author has gathered all the essential facts known relating to this in- 
teresting region, whether observed Ijy himself or l)y others, making a 
monograph similar to those of Upham and of Leverett on certain por- 
tions of the drift of the United States, but less bulky. He describes, 
and frequently illustrates by diagrams, the various elements of the 
drift-plains, including their terminal moraines, and conclvrdes with a 
chapter on post-glacial modifications of the drift, whether by wind or by 
wave. In giving the order of succession of the north German Quater- 
nary formations, as indicated by the facts presented in the volume, the 
author presents the following scheme : 
