'Scientific Intelligence. — Geology. 187 



A ) S + C } S 



The formula for this species will be -p > Mi* 



The agreement in physical properties and chemical composition 

 of this garnet, with a mineral analyzed some years ago by Kobell, 

 under the name Compact Vesuvian, is worthy of remark. The 

 analysis is as follows : 



Silica, . . 41.65 Lime, . 92.70 



Alumina, . . . 17.60 Trace of Magnesia. 



Oxide of Iron, . . 6.20 



= 97.05 



This mineral, a native of the Tyrol, is principally distinguished 

 from the garnet of Schwarzenstein by its intumescing before the 

 blowpipe, while the garnet melts without intumescence. But 

 this property of intumescence occurs in every variety of Vesu- 

 vian, while a tranquil melting characterizes the garnets. The 

 cause of this difference, and also that of the difference in crys- 

 tallization, in two minerals which have the same chemical com- 

 position, has not been ascertained. 



7. New Species of Brittle Silve7'-Glance. — Professor G. 

 Rose is at present occupied with the analysis of the different mi- 

 nerals known under the name Brittle Silver-glance (Sprod gla- 

 serz)., and has already detected among them several new and 

 distinct species. His brother. Professor H. Rose, is analysing 

 the tetrahedral copper- glance, and those minerals which contain 

 sulphuret of antimony and sulphuret of arsenic. 



8. Fluor-spar found in Ben-Gloe in Perthshire. — Mr James 

 Macinroy Duff, last summer, found, at the foot of Ben-Gloe, on 

 the east side of Glen- Tilt, specimens of cubical pale red colour- 

 ed fluor-spar. 



GEOLOGY. 



9. Humboldfs Jo/unrney to Siberia. — Humboldt, although 

 now past his sixtieth year, leaves Germany next spring, accom- 

 panied by Professor G. Rose, for Siberia- Probably he will ex- 

 tend his researches to the high land which separates India from 

 the Russian Empire. 



10. Meeting of Naturalists in Berlin, — Some years ago, Oken, 

 the celebrated naturalist, proposed that the naturalists of Germany 

 should meet together once a year, with the view not only of 

 becoming personally known to each other, but also of a mutual 



