NOTE
	Mrs. Carvill Lewis gladly avails herself of this oppor­tunity to express her indebtedness and gratitude to Professor T. G. Bonney for his kindness in arranging and editing the papers and notes contained in this book, in accordance with the wishes of the late Professor Henry Carvill Lewis, whose desire it was that his researches on the origin and matrix of the diamond should be given to the scientific world.