BOOK VII.

THE PHILOSOPHY OF MORPHOLOGY, INCLUDING CRYSTALLOGRAPHY.

CHAP. I. EXPLICATION OF THE IDEA OF SYMMETRY 67

_Art._ 1. Symmetry, what. 2. Kinds of Symmetry. 3. Examples in Nature. 4. Vegetables and Animals. 5. Symmetry a Fundamental Idea. 6. Result of Symmetry.

CHAP. II. APPLICATION OF THE IDEA OF SYMMETRY TO CRYSTALS 75

_Art._ 1. 'Fundamental Forms.' 2. Their use. 3. 'Systems of Crystallization.' 4. Cleavage. 5. Other Properties.

CHAP. III. SPECULATIONS FOUNDED UPON THE SYMMETRY OF CRYSTALS 80

_Art._ 1. Integrant Molecules. 2. Difficulties of the Theory. 3. Merit of the Theory. 4. Wollaston's Hypothesis. 5. Maxim for such Hypotheses. 6. Dalton's Hypothesis. 7. Ampère's Hypothesis. 8. Difficulty of such Hypotheses. 9. Isomorphism. {viii}