Alkali Carbonate Solution. 



103 



\ 



latter is hereinafter always alone mentioned, it being doubtless 

 the most important material in the natural occurrence of the 

 reaction. But magnesic carbonate at least may be always con- 

 sidered as practically included within the same considerations ; 

 and while our experiments have for the convenience of the 

 analytical operations been conducted with the sulphates, there 

 can be no doubt that the chlorids must be included, although 

 owing to the analytical difficulties encountered in their inves- 

 tigation, it is still uncertain whether (as is probable) the limits 

 of the carbonate formation are narrower than in the case of 

 the sulphates, in which the calcic sulphate formed is partially 

 thrown out of action in the form of gypsum crystals. 



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Tro^r-fistvc Ira/tj/br/nalion, ^ ji^kct^t /Su^ct^s l^tt^> Chrdo stales 



(The figures along upper line represent tenths of one per cent.) * 



The method employed in the determination was to precipi- 

 tate from the solution saturated with CO^, the calcic carbon- 

 ate and sulphate by means of alcohol, added until its percentage 

 reached about 65 per cent. ; then titrating the filtrate (which is 



