Xll CONTENTS 



equations ; Impossible reactions ; A knowledge of reacting com- 

 pounds and products necessary ; Equations for class room work. 

 Pages 120-126. 



CHAPTER XVIII 



Potassium, Sodium, and Their Compounds. Occurrence of potas- 

 sium ; Potassium hydroxid ; Potassium nitrate ; Potassium car- 

 bonate ; Potassium chlorate : Potassium sulfate ; Miscellaneous 

 potassium salts ; Occurrence of sodium ; Sodium chlorid ; Sodium 

 nitrate ; Sodium carbonate ; Sodium hydroxid ; Sodium phosphate ; 

 Miscellaneous sodium salts ; Experiments. Pages 127-133. 



CHAPTER XIX 



Calcium, Magnesium, and Their Compounds. Occurrence of cal- 

 cium ; Calcium carbonate ; Calcium oxid ; Calcium hydroxid ; Cal- 

 cium sulfate ; Calcium chlorid ; Bleaching-powder ; Calcium phos- 

 phate ; Mortar ; Glass ; Occurrence of magnesia ; Magnesium salts ; 

 Experiments. Pages 134-139. 



CHAPTER XX 



Iron, Aluminum, and Their Compounds. Occurrence of iron ; 

 Reduction of iron ores ; Wrought iron ; Steel ; Rusting of iron ; 

 Iron compounds ; Occurrence of aluminum ; Alums ; Pottery ; Ex- 

 periments. Pages 140-147. 



CHAPTER XXI 



Copper, Zinc, Lead, Tin, Arsenic, Mercury, Their Compounds and 

 Alloys. Commercial importance ; Occurrence of copper and its 

 metallurgy ; Copper sulfate ; Bordeaux mixture ; Occurrence of 

 zinc ; Compounds of zinc ; Galvanized iron ; Occurrence of tin ; Tin 

 salts ; Occurrence of lead ; Oxids of lead ; Lead carbonates ; Lead 

 salts ; Uses of lead ; Occurrence of arsenic ; Paris green ; Occur- 

 rence of mercury ; Compounds of mercury ; Experiments. Pages 

 148-154. 



CHAPTER XXII 



The Water-Content and Ash of Plants. Water; Dry matter; 

 Plant ash ; Form of the ash elements ; Amount of ash in plants ; 

 Importance of ash elements ; Water culture ; Sand culture ; Occur- 

 rence and function of ash elements ; Potassium ; Sodium ; Calcium ; 



