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0.933 0.939 0.946 0.952 0.959 0.965 0.972 0.979 0.986 0.992 1.000

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0.8095 0.814 0.81331 0.819 0.824 0.8173 0.825 0.829 0.8212 0.830 0.834 0.8252 0.835 0.839 0.8292 0.840 0.845 0.8333 0.845 0.850 0.8374 0.851 0.855 0.8415 0.856 0.861 0.8457 0.8620.866 0.8500 0.867 0.872 0.8542 10.872 0.878 0.8585 0.879 0.883 0.8629 0.885 | 0.889 0.8673 0.891 0.895 0.8717 0.897 0.901 0.87620.903 0.907 0.88080.909 0.914 0.8854 0.916 0.921 0.8900 0.922 0.927

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0.92390.970 0.976
0.92890.977
0.9340 0.985
0.9392 0.992
0.9444 1.000
0.9497
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0·795 0.800 0.805 0.810 0.814 0.818 0.822 0.826 0.829 0.832 0.835 0.838 0.842 0.845 0.848 0.851 0.854 0.857 0.860 0.863 0.865 0.868 0.871 0.874 0.876

0.879
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DESCRIPTION OF THE PLATES.

PLATES I AND II. Crystals.

1. Regular System.-A. Homohedral. Fig. 1–12.

6. Hemihedral.a. Tetrahedron. Fig. 13-17.-B. 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, POS + 2H 0) or acid arseniate of potash (K O, 2H 0, As OS + 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: Čalomel.

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;270: 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 H*0, HO, POS + 24H O) or arseniate of ammonia ;-96—100 : Ordinary phosphate of soda (2Na O, HO, POS + 24H O) 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: Hydrated 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. 121-130.

121-123: Sulphate of copper ;–124, 125: Axinite;—126: Gallic acid;-127: Succinate of ammonia ;—128: Succinate of soda ;—129: Boracic acid;—130: Alkargen.

7. Three-and-one-membered System.
a. Six-membered or Hexagonai System. Fig. 131-140.

131: Quartz;—132, 135: Sapphire;—133: Hyposulphate of strontia; -134, 136: Emerald ;-137–140: Calcspar.

b. Three-and-three-membered or Rhombohedral System.
Q. Forms derived from an obtuse rhombohedron. Fig. 141-150.

141—143 and 145—150: Calcspar;-144: Neutral hyposulphate of lead.

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.

PLATE III.

Schemes of Chemical Decomposition. Decomposed compounds are indicated by dotted lines; newly formed compounds, by full lines.

PLATE IV.

Apparatus. Electro-chemical Apparatus and Processes. App. 1–33. 25: Daniell's Constant Battery. 26: Grove's Battery. 27: Trough or Cell Apparatus. 28 and 29: Faraday's Voltameter. 31 and 32: Faraday's Battery.

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GENERAL CHEMISTRY; OR THEORY OF AFFINITY IN GENERAL.

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List of Works and Memoirs relating to Affinity ..........
I. FUNDAMENTAL NOTION OF AFFINITY ......
II. RANGE OF AFFINITY ........
III. FORMATION OF CHEMICAL COMPOUNDS.

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Conditions of Chemical Combination ....
Circumstances and Results of the Chemical Combination of Ponderable

Bodies.
Atomic Weight of Simple Substances..........

......... Relations between the Atomic Weights and Densities of Elementary

Bodies. ................
Atomic Weight of Compounds................................
Chemical Formulæ.....
Stoichiometrical Calculation..................
Relations between the Atomic Weights and Densities of Compounds....
State of Aggregation of Compounds...........
Isomorphism ..........
Calorific Relations of Compounds............
Relations to Light..
Chemical and Physiological Relations of Compounds ...............
Dimorphism .............

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Amorphism......................................................................................
Isomerism ........................
Polymerism ............
Metamerism

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V. MAGNITUDE OR STRENGTH OF AFFINITY.

Page In Decompositions in which the Affinity of Heat contributes to the result ..............

............ In Decompositions in which Ponderable Bodies are alone concerned...... 138 General Laws relating to Strength of Affinity .......

143 Columns of Affinity ............

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VL ORIGIN AND NATURE OF THE PHENOMENA OF AFFINITY. 1. Atomic Theory........

(a.) Constitution of Atoms ...............................

(6.) Chemical Combination........ 2. Dynamic Theory ............... A. Kant's Theory. B. Schelling's Theory....

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CHEMICAL RELATIONS.
I. Relation of Light to the other Imponderables.

Development of Heat by Light..
Development of Light by Heat........................

.......... Relation of Light to Electricity............

Relation of Light to Magnetism......
II. Relations of Light to Ponderable Bodies.

Combinations produced by the agency of Light ............ .............
Combinations accompanied by Decompositions ...................
Decompositions produced by Light: Calotype; Daguerreotype; Ther-

mography
Phosphorescence of Living Animals ...........

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Phosphorescence of Living Plants...
Phosphorescence of Putrefying Animals ..............
Phosphorescence of Putrefying Plants..
Phosphorescence by Irradiation..................
Phosphorescence produced by Heat ......................
Development of Light by Mechanical Force..........
Luminous Appearances accompanying Crystallization ...........

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