04 



SCIENTIFIC NEWS. 



unmanageable and bulky mafs. And again If to this mafs, 

 waflied out with water as well as poffible, carbonate of foda 

 be now prefented, a partial decompofition will only be efFeCted, 

 for it is the excels of the phofphoric acid of this fait only^ 

 which in that cafe forms the article fought. The remaining 

 portion of phofphoric acid remain united to the lime, in the 

 form of phofphate of lime. The above procefs is therefore 

 evidently better. 



Sulphate of Soda prepared from Sulphate of Lime. 



Sulphate of foda This method confifts in making into a pafte with a fufficlent 

 ffomgypfum. quantity of water, eight parts of burned gypfum, or fulphate 

 of lime, five of clay, and five of common fait. This mixture 

 is burned in a kiln or other convenient oven, and then ground 

 to powder, diffufed in a fufficient quantity of water, which 

 after being ftrained and evaporated, is fuffered to cryftallize. 



Scherer IX. 6 K 



