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Boart, Carbonado, and Graphite 81 VIII. Physical and Chemical Properties of the Diamond 89 IX. Genesis of the Diamond 115 X. The Natural Formation of the Diamond 127 XI. Meteoric Diamonds 134 Index 141 [xiv] [xv] LIST OF PLATES The Cullinan Diamond, from a photograph by the Author (see pp. 76–79 ) Frontispiece FIG.