158 Analysis of Scientific Books. 
The earthy class contains two orders (as just stated.) The 
first includes earthy minerals, which are divided into five genera 
—the Siliceous, Magnesian, Aluminous, Zirconian, and Gluci- 
nian. The first genus contains 15 families, viz., Flint, Garnet, 
Idocrase, Schorl, Epidote, Pitchstone, Zeolite, Lasulite, Felspar, 
Mica, Slate, Clay, Lithomarge, Hornblende, and Augite. 
The second genus contains three families :—Magnesite, Talc, 
and Chrysolite. The third genus has four families :—Ruby, 
Nepheline, Topaz, Cyanite; and the fourth and fifth genera one 
each, viz., Zircon and Glucine. 
The second order, Acidiferous Earthy Minerals, has also five 
genera:—1. Calcareous, containing the following families :— 
Carbonates, Phosphates, Fluates, Sulphates, Borosilicates, 
Tungstates, Arseniates, Silicates. 2. 4duminous—Sulphates, Phos- 
phates, Fluates, Mellates. 3. Magnesian—Carbonates, Sul- 
phates, Borates, Silicates. 4. Barytic—Carbonates, Sulphates. 
5. Strontitic—Carbonates, Sulphates. The Alcaline Class has 
three genera. 1. Salts of Potash—Nitrates. 2. Salts of Soda— 
Carbonates, Sulphates, Muriates, Borates. 3. Salts of Ammona 
—Sulphates, Muriates. 
The Metallic Class contains 23 genera. 1. Gold—Alloys. 
2. Platinum. 3. Palladium. 4. Iridium. 5. Tellurium. 6. Mer- 
cury—Alloys, Sulphurets, Chloride. 7. Stlver—Alloys, Sul- 
phurets, Oxides? Chlorides, Salts. 8. Copper—aAlloys, Sul- 
phurets, Oxides, Salts. 9. Jron—Alloys, Sulphurets, Oxides, 
Salts. 10. Manganese—Oxides, Salts. 11. Uraniwn—Oxides. 
12. Cerium—Salts. 13. Tantalum—Oxides. 14. Cobalt—Al- 
loys, Sulphurets, Oxides, Salts. 15. Nickel—Alloys, Oxides, 
Salts. 16. Molybdenum—Sulphurets, Oxides. 17. Tin—Sul- 
phurets, Oxides. 18. Titanewm—Oxides, Salts. 19. Zinc— 
Sulphurets, Oxides, Salts. 20. Bésmuth—Alloys, Sulphurets, 
Oxides. 21. Lead—Alloys, Sulphurets, Oxides, Salts: 22. 
Antimony—Alloys, Sulphurets, Oxides, 23. Arsenic—Alloys, 
Sulphurets, Oxides. 
The Inflammable Class contains four genera. 1. Carbonaceous 
—Diamond, Graphite. 2. Bituminous—Bitumen, Coal. 3. Re- 
sins. 4. Sulphur. 
Under each family are included the species, in many cases 
numerous, but which our limits will not allow us to insert here. 
When two or more minerals have considerable resemblance to 
one another, their distinguishing characters are generally well 
given. The following passages will serve at once as instances 
of this, and as fair specimens of the style of the work. 
Page 181. Mary. Are these large crystals epidote ? 
Mrs. L. Yes; its most common colour is deep pistachio green; and 
the large crystals and massive epidote, are only translucent on the edges ; 
the primitive form is a right prism, of which the bases are oblique angled 
parallelograms, but they are rarely-if ever found without modifications. 
