X CONTENTS 



PAGE 

 VI. WEATHER AND CLIMATE. 



Weather in the Affairs of Men 133 



Weather as Affected by Highs and Lows 137 



The Thermometer, and Heat Transmission 140 



Solar Heating 147 



-,yil. MATTER AND FORCE. 



Some Properties of Matter, and Changes in Matter Due to Force 151 



VIII. WORK AND MACHINES. 



Meaning of the Terms Work and Energy 160 



*Levers and Pulleys 163 



Electromagnets 168 



IX. SOME CHEMISTRY OF EVERYDAY LIFE. 



A Review of Some Chemical Changes 173 



*The Chemistry of Cleaning . 177 



*Acids, Bases, and Salts A . . 180 



*Electricity and Chemical Changes 184 



"Limestone and Other Carbonates 190 



*The Chief Among Metals 196 



X. AT OUR HOMES. 



Rooms of the House, Their Furnishings, and the Cost of Living 206 



Fuel and Lights for Modern Homes 214 



Some Foodstuffs 219 



* The Carbohydrates . . 226 



Fires, Burns, and Various Accidents 233 



XI. SURROUNDINGS OF THE HOME. 



The Garden, and Its Care . . . . . 241 



Soil Conditions for Plant Growth 247 



Tree Planting *-'. . . . 254 



Trees of the Neighborhood 259 



Some Plant Studies 263 



Usefulness of Plants to Man 268 



Birds Around Our Homes 275 



XII. SOME CONDITIONS AFFECTING INDUSTRIAL LIFE. 



Changes in Manner of Living 281 



Social and Economic Conditions Affecting the Wage Earner . . 290 



*See page 372. 



