CONTENTS. 



PAGE 



Preface to the American edition ' . ' . . r . . 3 

 Preface . . . . . . .'.' * . . . 4 



Chloride of sodium . . . . . .13 



Chloride of silver ' . . . ./.'.'.'. 14 



Sulphate of soda 15 



Tartrate of potassa and soda > . 16 



Sulphate of soda and ammonia . . ' . . . . 18 

 Sulphate of potassa and magnesia . . . .19 



Carbonate of potassa and magnesia . . , . .21 

 Epsom salt and Glauber's salt . . . . . " . 21 

 Phosphate of soda and .ammonia . '. . '. '. . 22 

 Phosphate of magnesia and ammonia . . * . 23 

 Chlorides of potassium, sodium, and magnesium . . . 25 



Dolomite and bitter-spar .. 27 



Bone-ash 27 



Apatite . .29 



Barite, celestite, and gypsum ...... 31 



Alumina-alum ....... . . 33 



Iron-ammonia-alum ........ 34 



Alumina-chrome-alum . . . . .34 



"Wavellite and phosphates of alumina in general . . 36 

 Spinel. (Alumina and magnesia in general) ... 37 



Alumina and sesquioxide of iron 38 



Phosphoric acid and sesquioxide of iron .... 41 

 Hematite and liraonite V '. . . 42 

 Magnetite . '. '. . \ \ ". ^ * . 44 

 Siderite '. ; ". . . ', . . 46 

 Bog iron-ore . '* . '.- . . . . '\* . 49 

 Wet assay of iron " . " * . 50 



