Mineralogy and Geology 425 
pear in general to be a faithful exhibition of the true affinities of the 
species. 
The mind uneducated in Science may revolt at seeing a metallic 
mineral, as galena side by side with one of unmetallic lustre, as blende ; 
and some systems, in accordance with this prejudice, place these spe- 
-cies in separate orders. Like the jeweller, without as good reason, the 
same works have the diamond and sapphire in a common group. But 
S, 
which are mere externals, and this truth should be acknowledged by 
the Mineralogist rather than defied. Others, while recognizing the close 
relations of the carbonates of lime, iron, zinc and manganese, (calcite, 
_ spathic iron, smithsonite and diallogite,) or of the silicates of lime, iron, 
manganese, (wollastonite, augite, rhodonite,) are somewhat startled by 
finding silicate of zinc, or silicate of copper among the silicates of the 
earths or of other oxyds. But the distinction of ‘‘ useful” and ‘* use- 
less,” or * ores” and * stones,” although bearing on ‘‘ economy,” is not 
Science. 
The advantages which the arrangement of the last edition afforded 
those interested in mining and metallurgy, is secured in the present 
volumes by an index to the useful ores, in which their distinctive char- 
acters and their relative importance in the Arts are mentioned, and 
segeagee: are given to the pages where the full descriptions are to be 
ound 
nd. 
During the four years since the appearance of the last edition, the 
Science of Mineralogy has increased in species from 625 to 660 ; and 
this notwithstanding the bankruptcy of some 45 of the number. The 
important work of Rammelsberg on Chemical Mineralogy, has been 
continued in a fifth Supplement, issued in 1853. similar review of 
his Krystallo-chemische Mineral-System (1853) ; Professor von Kobell, 
a work on Mineralogical Nomenclature (1853), and a new edition of 
his excellent Tables for the Determination of Minerals, (48538); Dr. 
Franz Leydolt and Professor Adolf Machatschek, of Vienna, their Ele- 
portfolio of plates of figures for the construction of Models of crystals 
(1854) ; Professor Quenstedt, of Tubingen, the first paytof a Treatise 
on Mineralogy (1854); Dr. C. F. Naumann, a revised edition of his 
invaluable Elements of Crystallography (1854); Dr. Fried 
of Erlangen, Elements of the Mathematical Relations o 
F. H. Sch 
Srystallographer of St. Petersburg, the first numbers of his ** Mineralo- 
gie poet ee a4 in Guarto, (1853, 1854) ; H. J. Brooke and W. H. 
Srconp Srries, Vol. XVIII, No. 54—Nov., 1854. 54 
