| [9] The dispersion is the difference of the refractive indices | | corresponding to the B and G lines of the solar spectrum. The | | value for crown-glass is ·016. | | | +--------------------------------------------------------------------+ INTERESTING AND IMPORTANT BOOKS JEWELLERY. By CYRIL DAVENPORT, F.S.A. With a Frontispiece in Colour and 41 other Illustrations. Second Edition. Demy 16mo. [_Little Books on Art._ JEWELLERY. By H. CLIFFORD SMITH, M.A. With 50 Plates in Collotype, 4 in Colour, and 33 Illustrations in the text. Second Edition. Wide royal 8vo, gilt top. [_Connoisseur’s Library._ GOLDSMITHS’ AND SILVERSMITHS’ WORK. By NELSON DAWSON. With 51 Plates in Collotype, a Frontispiece in Photogravure, and numerous Illustrations in the text. Second Edition. Wide royal 8vo, gilt top. [_Connoisseur’s Library._ EUROPEAN ENAMELS. By H. H. CUNYNGHAME, C.B. With 58 Illustrations in Collotype and Half-tone and 4 Plates in Colour. Wide royal 8vo, gilt top. [_Connoisseur’s Library._ ENAMELS. By Mrs. NELSON DAWSON. With 33 Illustrations. Second Edition. Demy 16mo. [_Little Books on Art._ Transcriber’s Notes: - Text enclosed by underscores is in italics (_italics_). - Redundant title page has been removed. - Blank pages have been removed. - Front publication list moved to the back. - Silently corrected typographical errors. - Where possible Unicode fractions have been used, otherwise they are formatted as example “1-5/16”. End of the Project Gutenberg EBook of Gem-Stones and their Distinctive Characters, by G. F. Herbert Smith