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XIV CONTENTS.

Class Monoclinala, G7

General Remarks on the Fundamental Form, . . . .67

Crystallographic Signs of Planes, ..... 67

Determination of the Interfacial Angles of ilonoclinate Forms, . 68

Determination of the Lengths of the Axes, ... 69

Rules for the Determination of the Signs of Monoclinate Planes incombination, by Inspection, ...... 70

Examples of the Application of the preceding Principles, . 71

Class Triclinata, ....... 74

Crystallographic Signs of Triclinate Forms, ... 74

Determination of the Interfacial Angles, . . .74

Determination of the Dimensions of Triclinate Forms, . . 78

Determination of the Signs of Planes, . . . . 78

Application of the preceding Principles, .... 79

APPENDIX B.

CHEMICAL CLASSIFICATION.

General Remarks on Chemical Classifications, . . .81

Tabular view of a Chemical Classification of Minerals, . . 83

MINERALOGICAL BIBLIOGRAPHY.

Foreign, .......... 89

American, ......... 94

Index, .......... 107