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A TEXT-BOOK OF MINERALOGY. With an extended treatise on 
CRYSTALLOGRAPHY and PHYSICAL MINERALOGY. By Edward §S. Dana, 
Curator of Mineralogy, Yale College, on the plan and with the co-opera- 
tion of Prof. James D. Dana. Illustrated with upwards of 800 wood- 
cuts and one colored plate. 8vo, cloth......... DOH Meares Ve aces ope aie $5.00 
This work is especially designed for those who desire to make themselves 
acquainted with the principles and methods of Crystallography, and of the no less 
important branch of Optical Mineralogy. With this end in view, about one-hali 
of the whole work, which covers nearly 500 pages, is devoted to these subjects, and 
_ the remainder is given to the description of mineral species. 
The system of Crystallography adopted is that of Naumann, which has the 
great advantage of being most readily intelligible to the beginner. The six crys- 
talline systems are taken up in succession, and the forms occurring under each, 
with their symbols, are described, and numerous figures are added as illustrations 
of the text. The methods of Mathematical Crystallography are then explained, 
and the application of them to all the ordinarily occurring cases given in full, so 
that any one with a knowledge of ordinary trigonometry can soon learn to make 
all necessary calculations. This subject closes with a chapter on the measurements 
of crystals, and others on twin crystals, the irregularities of crystals, crystalline 
aggregates, and pseudomorphous crystals. 
Supplementary to this portion of the work, there is given in the Appendix, a 
chapter upon Miller’s System of Crystallography, in which its principles and 
methods are clearly and concisely stated, and another upon the methods of draw- 
ing crystals. 
In the description of the physical characters of minerals, their distinguishing 
optical properties are developed with especial fullness, preceded by a statement of 
the fundamental principles of Optics upon which they depend, and a description 
of the instruments used in the research. A colored plate in the beginning of the 
volume shows the interference-figures observed when sections of different biaxial 
erystals are viewed in polarized light. 
The section on Chemical Mineralogy also includes a brief description of the 
methods of blowpipe analysis, and a table for the determination of minerals based 
upon these is given in the Appendix. 
The descriptions of mineral species cover about 200 pages; all species known 
up to the date of publication are included, but only those of the most importance 
are described at length. 
In addition to the chapters in the Appendix already alluded to, a fourth con< 
tains a catalogue of American localities of minerals. 
IV. 
MANUAL OF MINERALOGY AND LITHOLOGY. Containing ele. 
ments of the science of Minerals and Rocks, for the use of the practical 
Mineralogist and Geologist, and for instruction in Schools and Coileges. 
By Professor James D. Dana, of Yale College. New edition, revised 
and re-written. 12mo, cloth. ........33 Sie chars DORR Oke Se RE $2.00 
The prominent feature of this Manual is its arrangement of the ores under the 
head of the metals they yield. It is thus especially adapted to the wants of those 
interested practically in minerals, and also of Mineralogists not versed in chemistry. 
The work contains an account of the elements of Crystallography, and of the 
physical and chemical departments of Mineralogy; descriptions of mineral species, 
but with only brief notices of the less important kinds; a full table of American 
localities of minerals; and a table for the determination of minerals. The subject 
of Rocks is treated with considerable detail, all the kinds of rocks with their 
_ prominent varieties-being Gescribed, and the principles of the Science of Lithology 
simply though briefly explained and illustrated. 
