MINERALOGY. 335 



PRECIOUS STONES. 



BEHRENS, H. Mikroscopische Untersuchungen tiber die Opale. 



8vo. 38 pp., II. plates. 1871. 



DE BOURNON, The Count. A Descriptive Catalogue of Diamonds 

 in the Cabinet of Sir A. Hume. 



4to. 52 pp., V. plates. London, 1815. 

 EMANUEL, H. Diamonds and Precious Stones. 



8vo. 266 pp. London, 1867. 

 GURLT, A. Ubersicht der pyrogenneten Kiinstlichen Mineralien. 



8vo. 100 pp. Freiberg, 1857. 



JEFFRIES, D. A Treatise on Diamonds and Pearls. Fourth edition. 



8vo. 116 pp. London. 

 KING, C. W. The Handbook of Engraved Gems. 



8vo. 396 pp. London, 1866. 



The Natural History of Precious Stones and Gems, and of 



the Precious Metals. 8vo. 442 pp. London, 1865. 



The Natural History of the Precious Stones, and of the 



Precious Metals. 12mo. 364pp. London, 1870. 



KLUGE, K. E. Handbuch der Edelsteinkunde fur Mineralogen, 

 Steinschneider und Juweliere. 8vo. 561pp. Leipsig, 1860. 

 MAWE, John. A Treatise on Diamonds and Precious Stones. 



8vo. 166 pp., III. plates. London, 1815. 



Travels in the Interior of Brazil ; with a Particular Account 



of the Gold and Diamond Districts. 



8vo. 493 pp. London, 1821. 

 SCHRAUF, Albrecht. Handbuch der Edelsteinkunde. 



8vo. 252 pp. Vienna, 1869. 

 TRAILL, G. W. An Elementary Treatise on Quartz and Opal. 



12mo. 73 pp. Edinburgh, 1870. 



