Meteorology — Chemistry. 



371 



22. Meteoric Stone J'ron> Caxtres. — On the 18th July last the minister 

 of the Interior presented to the Academy of Sciences a fragment of the 

 metoric stone which fell at Castres. The colour of this stone, which wafe 

 not at all deep, seemed to indicate that it is less ferruginous than most of 

 those of the same origin. — Lc Globe, 20th July 1826. 



II. CHEMISTRY. 



23. On the Chemical Ooffipositwn of Felspar and Serpentine. By M. 

 Peschier. — The researches of M. Peschier on titanium having led him 

 to suspect its presence in felspar, he undertook the analysis of several va- 

 rieties of that mineral ; namely, of the adularia of St Gotthard ; the green 

 compact variety from Siberia ; the glassy felspar of Drachenfels in West- 

 phalia; the white felspar of Auvergne ; and the andalusite, from the Tyrol. 

 The following table contains the result of his analyses, which are compared 

 with those of other chemists: 



M. Peschier has also detected the presence of titanium in three varieties 

 of serpentine. The first kind is the common spotted serpentine of Saxony. 

 It is of a dull green colour, is soft to the touch, and has a conchoidal frac- 

 ture. 



The second is the common magnetic serpentine of the Upper Palatinate, 

 which M> Humboldt observed between Goldchronach and Munichberg. 

 It is rough to the touch, and has an irregular fracture. 



The third variety is from the Vale of Aosta. Its structure is quite ho- 

 mogeneous ; it has a moss-green colour, scaly fracture, and like the talcs 

 is unctuous to the touch. It contains magnetic iron. 



The results of M. Peschier, together with those of other chemists, are 

 contained in the following table : — 



VOL. V. NO. IF. OCTOBER 1826. 



1.1) 



