CONTENTS 



CHAPTER PAGE 



I. INTRODUCTION i 



II. HEALTH 5 



III. CHEMISTRY OF COMMON THINGS 9 



IV. CHEMISTRY OF BAKING 23 



V. PRESERVATIVES AND DISINFECTANTS 31 



VI. HABIT-FORMING AGENTS 40 



VII. OXYGEN AND OXIDATION 47 



VIII. CARBON DIOXIDE 53 



DC. BREATHING AND VENTILATION 59 



X. MATTER AND ENERGY 64 



XL HEAT : 71 



XII. HEAT OF VAPORIZATION 84 



XIII. HEAT OF FUSION AND DISSOLUTION 92 



XIV. HEATING BUILDINGS 95 



XV. FOOD 112 



XVI. WATER 134 



XVII. THE AIR 145 



XVIII. SOME PROPERTIES OF GASES 163 



XIX. SIMPLE MACHINES 174 



XX. WATER WHEELS AND WINDMILLS 199 



XXI. STEAM AND GAS ENGINES 207 



XXII. WATER OR LIQUID PUMPS 213 



XXIII. GAS PUMPS 221 



XXIV. CITY WATER SUPPLY 225 



XXV. MAGNETS 237 



XXVI. SIMPLE ELECTRICAL APPLIANCES AND MACHINES. 248 



XXVII. LIGHT 272 



XXVIII. THE HUMAN EYE 279 



XXIX. ARTIFICIAL LIGHT 289 



