376 THE AMERICAN NATURALIST. [VOL. XXXII. 
discovered any evidence that this is the case. Unfortunately the 
distinction between bedding and schistosity is not made clear. The 
secondary structure, by inference at any rate, is made coincident 
with the primary one, for we read that “the presence of a schistose 
structure is not always proof of origin from sediments.” 
Of course Professor Rice had a very difficult position to fill. He 
has filled it well, and yet we wish for the sake of the students who 
will use the revised text-book that he had departed a trifle more from 
Professor Dana’s views, and incorporated in the book the latest 
results of investigations upon the oldest rocks of the globe and on 
metamorphism. W.S.B. 
MINERALOGY. 
The Fourth Edition of Fuchs’s Determinative Mineralogy.’ — 
Although the Anleitung zum Bestimmen der Mineralien, by Prof. Dr. 
C. W. C. Fuchs, was first published thirty years ago, and has since 
been revised by Professors Streng and Brauns, the well-known vol- 
ume still preserves its original excellent features. The third edition 
was published only eight years ago, Since this time there has been 
so much added to our knowledge of minerals that a fourth edition 
has been demanded. Dr. Brauns, who is responsible for the new 
edition, is eminently fitted for the work that has devolved upon him, 
and the new volume that has been. brought out under his direction 
is fully abreast of the times. 
There has been little change made in the sections treating of 
blowpipe and microchemical reactions except such as are necessitated 
by the progress of knowledge during the past decade. The tables 
for the determination of minerals, however, have been entirely recon- 
structed. The minerals are no longer separated into groups accord- 
ing to their crystal systems, but are divided according to hardness. 
These groups are further divided into two classes, vżz., minerals with 
metallic luster and those without metallic luster. The metallic - 
minerals are next subdivided according to color, and the non-metallic 
ones according to the color of their streak. The cleavage, crystal 
form, and manner of occurrence serve further as distinguishing 
characteristics, and simple chemical tests are made use of for pur- 
1 Fuchs, C. W. C. Anleitung zum Bestimmen der Mineralien. Vierte 
Auflage, neu bearbeitet, von Dr. Reinhard Brauns. Giessen, J- Ricker, 1898. 
xii + 235 pp. 
