OF AMMONIA. 239 



water, (the result of his analysis was 23*3.*) 

 Now it is obvious, that the salt which I analyzed 

 contained per cent. 



Sulphuric acid G0-6o6 



Ammonia 25'75~ 



Water l.'J-636 



99'999 



Berzelius' salt, therefore, must have contained 

 two atoms of water. The salt which I analyzed 

 was composed of regular rectangular plates with 

 bevilled edges, and from some observations on 

 the crystals, I am induced to consider their pri- 

 mary form as a four-sided rectangular prism 

 with square bases. It would seem from Berze- 

 lius' analysis, that there is another sulphate of 

 ammonia, containing twice as much water as the 

 salt which I analyzed. It is the only form of 

 the sulphate of ammonia with which I am ac- 

 quainted. I wish Berzelius had mentioned the 

 shape of the crystals which he examined. 



2. Nitrate of ammonia. To ascertain the com- Mode of 



analysis. 



position of this salt I put a quantity of it into 

 a small retort, from the beak of which a bent 

 tube passed to the top of a graduated glass jar 

 filled with mercury, and standing on the mercu- 

 rial trough, the apparatus was precisely similar 

 to the one described in chapter sixth, sect. 1st, p. 



* Afhandlingar, V. 14S. 



