CONTAINING AMMONIA. 



centrating the mixture by evaporation. Beauti- 

 ful octahedrons of a ruby red colour separate by 

 crystallization. This salt is permanent, soluble 

 in water, and its constituents are 



1 atom persesquimuriate of iron 

 1 atom sal-ammoniac 



18-6875 



It is remarkable that this salt contains no water, 

 though the permuriate of iron has such a ten- 

 dency to combine with that liquid that it deli- 

 quesces when exposed to the air. Indeed, the 

 compound salt itself gradually attracts moisture 

 from the atmosphere. 



16. Ammonio- muriate of copper. This salt Ammoni - 



11 muriate of 



crystallizes in rectangular prisms terminated by copper. 

 four-sided pyramids. It has a fine green colour, 

 and is composed of 



2 atoms muriate of copper 19-25 

 1 atom sal-ammoniac . 6-75 

 9 atoms water 10-125 



36-125 



17- Ammonio-muriate of platinum. This fine Ammonio- 



.... _ muriate of 



yellow salt is anhydrous, and consists or platinum. 



1 atom bichloride of platinum 2 1 

 1 atom sal-ammoniac . . 6-75 



27-75 



