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DESCRIPTION OF THE PLATES.

PLATES I AND II. Crystals.

1. Regular System.-a. Homohedral. Fig. 1-12.

b. Hemihedral.-a. Tetrahedron. Fig. 13-17.-8. Pentagonal Dodecahedron. Fig. 18-20.

2. Square Prismatic or Four-membered System.—a. Homohedral. Fig.

21-39.

21 and 22: Anatase;-23, 29: Zircon;-24, 27, 33: Molybdate of lead;-25, 26: Hydrated ferrocyanide of potassium;-28, 39: Vesuvian; -30: Acid phosphate of potash (KO, 2HO, PO5 + 2H O) or acid arseniate of potash (K O, 2H O, As 05 + 2H 0);—31: Sulphate, seleniate, or chromate of silver and ammonia;-32: Apophyllite ;-34: Cyanide of mercury;-35: Nickel-speiss;-36: Sulphate or seleniate of zinc or nickel; -38: Calomel.

b. Hemihedral. Fig. 40.-Parasulphat-ammon.

3. Two and two-membered or Right Prismatic System. Fig. 41-80. 41-44: Sulphur; 45: Tartar-emetic;-46: Iodine;-47, 48: Sulphate of lead; -49: Sulphate of baryta;-50: Nitrate of silver;-51, 52: Chloride of barium;-53: Hyperchlorate or hypermanganate of potash or ammonia; -54-58: Nitrate of potash ;-59: Sulphate or seleniate of silver or soda, and hypermanganate of baryta;-60: Camphor of cubebs;-61—63: Acid phosphate of soda, crystalline system 1;-Acid phosphate or arseniate of soda. System 2;-65: Morphia;-66: Hyposulphate of silver; -67, 68: Mellitate of ammonia;-69: Bicarbonate of ammonia;-70: Protochloride of mercury;-71, 72: Sulphate of magnesia;-73: Sulphate of zinc or nickel ;--74: Indigo;-75: Chloride of mercury, copper, and potassium;-76, 77: Neutral sulphate of ammonia, or neutral sulphate, seleniate, chromate, or manganate of potash;-78: Oxalate of ammonia; -79: Citric acid;-80. Rochelle salt.

4. Two-and-one-membered or Oblique Prismatic System.-a. The base making an oblique angle with the obtuse lateral edge of the rhombic prism. Fig. 81-100.

81, 87: Iodide, bromide, or chloride of potassium with four atoms of water; 82: Chondrodite;-83: Chlorate of potash;-Sulphate of magnesia and potash;-85: Sulphate of nickel and potash;-86: Chromate of ammonia;-88: Hypermanganate of silver;-89: Pyrophosphate of soda;-90: Bicarbonate of potash.

b. The acute lateral edge of the rhombic prism making an oblique angle with the base. Fig. 101-116.

91, 92: Augite;-93-95: Neutral phosphate of ammonia (2N HO, HO, PO+ 24H O) or arseniate of ammonia;-96-100: Ordinary phosphate of soda (2Ña O, HO, PO + 24H 0) or arseniate of soda;101, 102: Phosphate or arseniate of soda and ammonia;-103, 105: Borax; 106: Acetate of lead;-107, 108: Phosphate or arseniate of soda and potash ;-109: Tartaric acid;-110: Acetate of copper ;-111:

Schemes of Chemical Decomposition.

Decomposed compounds are indicated by dotted lines; newly formed
compounds, by full lines.

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