Cliemistry. 175 



(Mg\ .. .. 



/ >S + AS + Aq, MgC*. 



10*. Analysis of Glauber Salt. — From Muhlingen on the Reuss in Swit- 

 zerland, according to Dr Frey of Aarau : 



Dry sulphate of soda, 44.4425 



Hydrochlorate of soda, 0.1004 



Water, 55.4571 



V. Leonhard's Miner alogische Zeitschrift, October 1827. 



17. Cadmium*— Cadmium is found, according to Mr Kersten, in Freiberg, 

 in a black variety of blende from the mine Alte Mordgrube, near Freiberg. 



18. Analysis of Mica, Chlorite, and Talc, with one Axis of Double Re* 

 fraction. By Professor Von Kobell. — Professor Von Kobell of Mu- 

 nich (Kastner's Archiv. vol. xii. p. 29, &c.) has published a paper on mi- 

 ca, chlorite, and talc, with one axis of double refraction. The composition 

 No. 1, is that of a mica from Monroe, in New York, which occurs in 

 tables of blackish-green colour, and with a specific grammer = 2.78; 

 No. 2, of a greenish-black mica, with 2.92 sp. gr. from Karosulik, in 

 Greenland ; No. 3, of a chlorite, which occurs in six-sided pyramids, 

 with the angle in the edges of the axis = 128°, and with 2.65 sp. gr. at 

 Achmatof, in Siberia ; No. 4, of a chlorite, with 2.85 sp. gr. from the Fil- 

 ler-valley, in Tyrol, are the following : — 



for the analysis No. 2, F J- S + K > S ; for the analysis No. 4, p ( c2 

 + 6 Aq. 



19. Professor Erdmanns New Chemical Journal. — Professor Otto Linne 

 Erdmann of Leipsic, has published since the beginning of this year, with 

 the assistance of other chemists, a " Journal of Technical and Economical 

 Chemistry," in monthly numbers. 



20. On a new method of preparing Chromic Acid, By M. Arnold 

 M aus. (Poggendorff 's Annalen, xi. 83.)— This method consists in decom- 

 posing a hot concentrated solution of the bichromate of potash by silicated 



