AXUMIVOUS CHALYBEATE 8FB.IKG IN I. OF VTIGHf. (jf 



this saline residue, and evaporate the solution slowly, in 

 order to discover any fixed alknline sulphate or muriate 

 which may exist in the water. To boil in caustic pot- 

 ash the precipitate containing the iron and earths, in order 

 to separate the ahimine and silica. To dissolve the remain- 

 ing' mass (supposed to contain iron, lime, and magnesia) in 

 nitric acid, evaporate to dryness, and apply a red heat, in 

 order to render the peroxide of iron thus formed inso- 

 luble in acid. To add to the mass, minutely pulverized, 

 nitric or acetic acid, as either of these acids will only dis- 

 solve the lime and magnesia, which may be separately ob- 

 tained by their respective reagents. And lastly, to ascer-^ 

 tain the quantity of oxide of iron, supposed to have beeu 

 left untouched by the acid. 



3d method. To precipitate from another portion of water 3d m-ctbtriL 

 th« iron, lime, alumine, and silica, by a solution of neutral 

 carbonate of ammonia, which reagent retains the magnesia 

 in solution. To boil the precipitate in caustic potash, 

 which takes up the alumine and silica. To redissolve in 

 muriatic acid the residue not taken up by potash, which 

 consists ef lime and iron — separate the iron by pure ammo- 

 nia, and the lime by oxalate of ammonia*. Precipitate the 

 magnesiaf from the clear solution by an alkaline phos- 

 phate. 



4th method. To evaporate to dryness u known quantity 4th method. 

 of the water, and to boil the residue in caustic potash, which 

 will dissolve the alumine and silica, both of which may be 

 precipitated again by muriate of UmraoniaJ. Treat the re- 

 sidue, insoluble in potash and supposed to contain iron, 

 lime and magnesia y in the manner pointed out in the 2d 

 method. 



* It is necessary to precipitate the iron before the lime, whenever 

 any considerable quautity of sulphate or muriate of iron is present. 

 For oxalate of ammonia acts npon solutions of iron, as will be fully 

 explained under the head of sulphate of lime. 



■\- The magnesia might be equally, and perhaps more conveniently 

 sf parated, by boiling a known quantity of the solid residue in the neu- 

 tral carbonate of ammonia, instead of applyiug this reagent to the 

 water itself. 



J The mode in which the silica may be separated from the alumine 

 will be detailed in a subsequent part of this paper. 



5th 



