508 REVIEWS 
J 
All of the illustrations are in orthographic projection, crystal projec- 
tions being purposely omitted. The relations of the classes in each system 
are well brought out by tables and diagrams. The systems of notation 
of Weiss, Naumann, and Miller are used throughout the book in parallel 
columns, giving at a glance the relations between them. The classifica- 
tion of Groth is followed in the reverse order. 
The book seems well suited to its purpose, and puts in a concise and 
compact form that part of its subject which is absolutely essential for an 
understanding of crystallography. Let 
Das Berneroberland und Nachbargebiete, specieller Theil. By A. 
BaLtzeR. Berlin: Borntraeger. Pp. 330, with 74 figures, and 
a map of the routes. 
A series of European geological guidebooks is now being published by 
the Gebriider Borntraeger in Berlin. Ten of these, devoted to the Elbe 
valley near Dresden, Mecklenburg, Bornholm, Pomerania, Alsace, Riesen- 
gebirge, Schonen, Campania, Italian Alps, and the Alps of Eastern Switzer- 
land, are already out. The latest guide, that of the Bernese Oberland, is 
in two volumes, the first of which, describing special detailed routes, has 
recently appeared; the second volume, devoted to more general topics, 
including stratigraphy, formation of the mountains in general, a section 
upon the modern tectonics, the Aarmassiv, and the diluvial Aargletscher, 
is soon to follow. The chief attraction of this work lies in the field of 
tectonics, and as this obtrudes itself upon the traveler, it is here brought 
into the foreground and explained by the aid of profile sections. Long 
lists of rocks and minerals which may be studied to better advantage in 
museum collections are here avoided. 
The general plan of the booklet is to follow one principal route through 
the Bernese Oberland proper, from which there are numerous side excur- 
sions to points of interest near the main lines of travel. In addition there 
are three supplementary routes from the Oberland to Lake Lucerne, by 
the Briinig, Susten, and Furca passes, in the last of which the St. Gotthard 
region is included. 
The first chapter treats of that model of folded mountain structure, 
the Bernese Jura, than which there is no better introduction to the tectonics 
of the Alps. Following this are placed the regions intermediate between 
the Jura and the high Alps—Bern, the Lake of Thun, and Interlaken. 
In the Oberland proper the route visits in succession the well-known 
centers of attraction, Miirren, Wengern Alp, Grindelwald, Meiringen, 
