52 Sketch of the latest Improvements [Jan. 



rRed oxide of iron 94-38 



-I Phosphate of lime 2-75 



Iridescent iron ore from i Magnesia 0-16 



Grengesberg ] Stoney matter 1-25 



^Volatile matter 0*50 



99-04. 



S*. Swine-stone. — Hisinger and Berzelius have analysed various 

 specimens of Swedish swine-stone. The following are the results of 



their labours : — 



C Carbonate of lime 99-1 



Transparent swine-stone fromj magnesia 



Garphyttan, in Nerike 



om J magnesia . . .'\ 



. . .S manganese. . > 0-1 



^_ iron J 



Black sparry swine-stone from 

 the same place 



100-0 



'Carbonate of lime 95*0 



manganese. ."^ 



magnesia . . > 1*5 



■ iron J 



^Alum-slate and iron pyrites . . 3*5 



100-0 



rCarbonate of lime 98-6 



j magnesia • • • "^ 



J'rismatic swine-stone <} manganese. . V 0*9 



I iron J 



l^Alum-slate -05 



100-0 

 rCarbonate of lime * 97-25 



Prismatic swine-stone from I ZZZII ^^agnesTa'!.*! 1-25 

 KinnekuUe ^^ i^^^ / 



1^ Alum-slate 1*50 



100-00 



Gehlen has proposed two alterations in the present mode of 

 analysing minerals ; and, in his analysis of prehnite, he has shown 

 that they may be employed with advantage. 1. He substitutes 

 carbonate of soda, instead of caustic alkali, for the original fusion 

 of the mineral in a platinum crucible. He found that this method 

 answers even in the analysis of corundum. 2. He substitutes car- 

 bonate of barytes for nitrate of barytes when our object is to oinain 

 the fixed alkali which we suppose to exist in any mineral. He has 

 found that this carbonate readily acts as a flux to minerals, and that 

 it answers better than the nitrate of the same earth. 



