1-84 Scientific Intelligence. 



'6, It attains its mini. 3. It attains its mini' 3. It has no minimum 



mum of volume when /i- mum of volume when so- of volume. 



quid. lid. 



4. The volumes of the 4. The volumes of fluid 4. The volumes of the 

 fluid indicated by the con- indicated by the conti- fluid indicated by the con- 

 tinuation of the progress of nuation of the progress of tinuation of the progress 

 dilatation in the solid are dilatation in the solid are of dilatation in the solid 

 greater than the observed equal to the observed re- arc less than the observed 

 results. suit*. results. 



Ann. de Chim. p. 211, Feb. 1829. 



III. NATURAL HISTORY. 

 MINERALOGY. 



10. Weissite, a new mineral species, — This mineral is named in honour 

 of the celebrated mineralogist. Professor Weiss of Berlin. Count Trolle- 

 Wachtmeister of Stockholm has given this name to a mineral from the 

 Erick-Matts mine at Fahlun, where it is found in chlorite-slate. It is 

 massive, and has traces of a crystalline form, which seems to be prismatic. 

 Cleavage parallel to the base of the prism, and parallel to the great diagon- 

 al. Colour grey, inclining to brown. Streak white. Lustre faint, be- 

 tween pearly and resinous. Scratches glass. Translucent. Specific gravity 

 = 2-808. According to the analysis of Count Wachtmeister, the mineral 

 consists of 





\\, Analysis oftheHisingerite or Silicate of Iron from Riddarhyttan 

 in Sweden. According to Mr Hisinger, this mineral consists of 



Silica, - - - - 36.30 



Peroxide of iron, - - 30.63 



Protoxide, - - - 13.76 



Water, . - - 20.70 



Formula, f S^ -it t S ■¥ ^ A q 



Poggendorff *s Annalen, vol. xiii. 505. 



