50 General Notes. 
with great clearness, with the aid of good figures, most of which are 
new. The second part, which deals with the properties of the indi- 
vidual minerals, is not as full as is Mr. Idding's translation of Kosen- 
busch's manual, but is entirely sufficient for all the purposes of 
students. Although a most excellent text-book for colleges, Mr. 
Kutley's work is hardly full enough in its special part for those who 
desire to make a specialty of petrography as an important aid in 
geological work. For those who wish merely to become acquainted 
with the methods of the science, there is no better book in any 
language. 
" Das Mineraleeich," ^ the fifth volume of Lenze's Natural His- 
tory Series, has been revised and brought up to date. In its present 
shape it is a handy little volume of five hundred and forty-four pages. 
It treats of the universal and special properties of minerals in a 
manner adapted to the wants of general readers and others, wlio are 
desirous of becoming acquainted with these substances, but who are 
unwilling to enter into their technical study. In the special part a 
large amount of space is devoted to those properties of the various 
minerals which make them suitable for economic use. As a conse- 
quence this portion of the book is much more interesting than the 
corresponding part in most text-books. In general style *'Das 
Mineralreich " reminds one of Quenstedt's Mineralogie. 
Crosby's "Tables for the Determination ^ of Common 
Minerals." has a great advantage over all other similar tables in com- 
mon use, in that it deals only with those minerals with which the 
student is likely to meet in his every-day work. The determinative 
methods are based upon the physical properties rather than upon 
the blowpipe characteristics of the individual species. The tabula- 
tion is carefully done, and the little book will surely be welcome in 
those schools which are not provided with complete sets of blowpipe 
apparatus. 
' Das Mineralreich. Bearbeitet von Dr. Otto Wiinsche. V. Auf . Gotlia, 
Thieanmanns Hofbuchhandlung, 1887. 544 pp., 16 Taf. 
=• Second Edition. By W. O. Crosby. Boston, 1888. 
