Cliap. 5.] Ammmiacal Vitriol. i 



it does not efflorefce like Glauber's fait, but on the 

 contrary flightly attracts the humidity of the air. It 

 is veiy foluble in water, two parts of cold or one of 

 hot water being luificient to hold it in folution ; it 

 cryftallizes by cooling ; but the moft perfect cryftals 

 are obtained by fpontaneous evaporation. It likewife 

 unites with ice, which it melts, producing at the fame 

 time an excefllve degree of cold. It does not act on 

 the earths, nor on magnefia , though this laft, according 

 to Bergman, feems to decompofe it after a length of 

 time. 



If mild-fixed vegetable alkali, that is alkali com- 

 bined with the carbonic acid gas, is diflilled with am- 

 moniacal vitriol, a double decompofition and combi- 

 nation tajce place. The vitriolic acid unites with 

 the fixed vegetable alkali, and forms vitriolated tartar. 

 The carbonic acid gas being at the fame time volati- 

 lized, together with the volatile alkali, alfo in a Irate 

 of gas, both unite, and form an ammoniacal fait, which 

 cryftallizes in the recipient. 



Ammoniacal vitriol feems not to exift in a ftate 

 of nature; nor is it ufcd eithej: in medicine or the 

 arts. 



