Mineralogy. 185 



12. Analysis of the Thraulite or Silicate of Iron from Bodenmau in Ba- 

 varia. — According to Dr Kobell, this mineral consists of 



p. 467. 



13. Seleniuret of Silver found in Seleniuret of Lead. — Professor G. Rose 

 of Berlin has found in the specimens of seleniuret of lead from Tilkerode 

 on the Harz, seleniuret of silver. — Poggendorff 's Annalen^ vol. xiv. p. 471. 



14. Hydrate of Silex, — An opal found in the Graphite mine of Pfaffen- 

 reith has been found by M. Schwitz to contain an extraordinary quantity 

 of water as an ingredient. It is of a grayish or bluish white colour. It 

 is translucent, and when exposed to a strong light it displays a feeble 

 opalescence. Before the blowpipe it instantly loses its transparency and 

 decrepitates. It is composed as follows : — 



Silex, - - 63.91 



Water, - - 34.84 



98.75 

 Ferussac's Bullet. Univers. Nov. 



15. Quartz crystals containing Anthracite Coal and Liquids. — The stu- 

 dents of Rensselaer school have found many quartz crystals containing 

 anthracite coal. There were two specimens with liquid, and one of them 

 had a piece of coal floating in the liquid. — Silliman's Journal, No. 32. 

 p. 362. 



16. Large crystal of Beryl. — A crystal of Beryl received from Ackworth, 

 New Hampshire, was nine inches across, and weighed forty-seven pounds, 

 —lb. p. 358. 



17. Anfangsgrunde der Mineralogie. Elements of Mineralogy, for the 

 use of Students. By William Haidinger, F. R. S. E. With 15 Copper- 

 plates. Leipzic, 1829. — This popular treatise of mineralogy is a German 

 edition of a volume of the Library of Useful Knowledge, which will ap- 

 pear soon in London. It contains an introduction to the science, the cha- 

 racteristic of the newest system of Mohs, and a description of the most im- 

 portant mineral species. In general this little volume is one of the best 

 works on mineralogy, and deserves to be recommended to all mineralo- 

 gists who wish to study that science in a scientific manner. 



18. Handbuch der Mineralogie. Manual of Mineralogy. By Professor 

 HAusMANN,Counsellorof his Royal Majesty the King of Great Britain and 



