390 



intelligence and Miscellanies. 



3. Tourmalines which contain a considerable quantity of 

 mafi^nesia. Four varieties were analysed. I. Black lounna- 

 line of Karengbucka, Sweden : Sp. Gr. 3-044. U. Kinck 

 tourmaline of Rabenstein in Bavaria: Sp. Gr. 3-113. III. 

 Black tourmaline of Greenland : Sp. Gr. 3-062. IV. Brown 

 tourmaline of Saint Gothard. 



The loss in the last analysis is very considerable, and M. 

 Gmelin states that he knows not what to attribute it to. — 

 Annales de Chim. Novembre. 



21. Botanii of Brazil. — The number of species collected 

 in Brazil, and now in the hands of European botanists, is 

 estimated at fourteen thousand ; of which number not more 

 thaii five hundred were known at the commencement of the 

 present century. — Bibliotheque Universelle, Novemhrc. 



22. Hi/drate of Silex. — M. Schmitz, among a variety of 

 opals, of whose characters and localities he gives an account, 

 describes one found in the graphite mine of Pfaffenreith, 

 which surpasses all the known varieties of this mineral in the 

 proportion of water it contams, which equals more than a 

 third of its weight. It forms druses or crusts of several lines 

 in thickness in a decomposed gneiss. Its color is greyish or 

 bluish white. It is translucent, and exposed to a bright light, 

 is feebly opalescent. Before the blow pipe it instantly 

 loses its transparency, and decrepitates. It contains 



Silex, 63-91. 



Water, 34-84. 



Bui. Univcr. Novembre. 



