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: Protosulphate of iron or cobalt;-112: Acetate of zinc;-113: Acetate of soda;-114: Carbonate of soda with ten atoms of water;-115: Hy- drated ferrocyanide of sodium;-116: Hydrated carbonate of magnesia. c. One-and-two-membered System. Fig. 117-119. 117: Oxalic acid;-118: Chromate of soda;-119: Sulphate of soda. 5. Mitscherlich's System. Fig. 120: Hyposulphite of lime. 6. One-and-one-membered or Doubly Oblique Prismatic System. Fig. 121-123: Sulphate of copper;-124, 125: Axinite;-126: Gallic acid; 127: Succinate of ammonia;-128: Succinate of soda;-129: 7. Three-and-one-membered System. a. Six-membered or Hexagonal System. Fig. 131-140. 131: Quartz;-132, 135: Sapphire;-133: Hyposulphate of strontia; B. Forms derived from an acute rhombohedron. Fig. 151-160. 151, 153, 155, 156 and 157: Specular iron;-152, 154: Calcspar;— 158: Sesqui-oxide of chromium;-159: Red silver ore;-160: Cinnabar. Schemes of Chemical Decomposition. Decomposed compounds are indicated by dotted lines; newly formed Electro-chemical Apparatus and Processes. App. 1–33. 25: Daniell's Constant Battery. In Decompositions in which the Affinity of Heat contributes to the In Decompositions in which Ponderable Bodies are alone concerned...... 138 |