eer 
302 Bibliography. = 
will find his studies greatly promoted by connecting it with the Botan- 
ical Manua mm 
nual of Beareloey. including Observations on Mines, 
Hotks; Reduction of Ores, and the application of the Science to the 
Arts, with 260 Babteiions; ; ewe ee the use  & Schools and Col- 
leges; by James D. Dana, A.M.; &c., 430 pp. New Haven: 
Durrie & Peck. 1848.—This Sisto: is intended for caattnanan in sci- 
entific and practical Mineralogy, and especially for the American stu- 
ent. The usual introduction on structure and physical and chemical 
characters, much simplified, occupies the first seventy-five pages, after 
which commence the descriptions of —_ The work since all 
American minerals and such others as are of importance ; while the 
rarer species are only briefly noticed in — type. The ar range- 
ment adopted, places the ores of the same metal together. This order 
is required by the practical mineralo ist, and considering the conven- 
ience of it for conveying economical information, it has many advanta- 
es for the ordinary purposes of instruction. The descriptions of the 
eral characteristics; after the descriptions, there are remarks on the 
distribution of the more important ores and mines,—the modes of assay 
and 1 tion,—the uses of the metal—besides tleeié facts of a histor- 
ical and statistical nature. In describing other minerals also, and the 
various rocks, their applications in the arts are mentioned, and as far 
as practicable in a small manual, the modes of use are explaine 
ned. 
The descriptions of the species of minerals are followed by a chapter 
on rocks—a catalogue of American localities of minerals brought down 
to the presen — convenient for the mineralogical tourist—a_ brief 
notice of ee ining regions—description of mineralogical imple- 
ments—values of American and i weights, measures and coins— 
and tables for the determination of minerals. 
The Manual contains also a of slog and a full Index. 
9. The British Desmidiee ; by Joun Raurs, M.R.C.S., &c., with 
a work of sect local interest, but owing to the cosmopolite 
character of es Desmidiez, it will be as serviceable to the American 
It includes figures and descriptions not only of 
all the British species, with their localities as far as known in Europe 
Amer ke the work as complete as possible, 
ing have edtinibeted their recent discoveries with 
regard <2 the European forms, while figures and —— of man’ 
curious American species never before published, have been supplied 
by Prof. Bailey. The plates which adorn this volume are far superior 
in their execution to any thing of the kind which has yet t appeared ; 
and in; n to representations of the different species in Harr 
sitions, they contain highly interesting figures of the spo 
sted by the author. In the introduction to the. sede 
