Vlii . CONTENTS. 



CHAPTER XIII.-OPTICS (Continued). PAGE 



Vision The Eye The Stereoscope Spectrum Analysis The Spectroscope The 



Telescope and Microscope Photography Dissolving Views Luminous Paint... 140 



CHAPTER XIV. SPECTRAL ILLUSIONS. 



A Spectre Visible Curious Illusions Ghosts 161 



CHAPTER XV. ACOUSTICS. 

 The Ear and Hearing Physiology of Hearing and Sound Sound as Compared with 



Light What is Sound ? Velocity of Sound Conductibility The Harmonograph 166 



CHAPTER XVI. ACOUSTICS (Continued']. 



The Topophone The Megaphone The Autophone The Audiphone The Telephone 



The Phonograph The Microphone ... ... 1 80 



CHAPTER XVII. ACOUSTICS (Continued). 

 The Tuning-Fork The Syren Sound Figures Singing Flames 193 



CHAPTER XVIII. ELECTRICITY. 

 Derivation of Electricity Sealing Wax Experiment The Electrophorus Leyden Jar 



Positive and Negative The Electroscope Electric Machines 197 



CHAPTER XIX. 

 Velocity of Electricity Experiments The Electric Egg Force of the Electric Spark 212 



CHAPTER XX. GALVANISM. 



Galvani's Discovery The Frogs Electrified Experiments Volta's Pile The Test- 

 Its Usefulness Faraday's " Researches." 217 



CHAPTER XXL MAGNETISM. 

 The Loadstone Magnetic Curves The Magnetic Needle The Mariner's Compass 



Magneto-Electricity ... 254 



CHAPTER XXII. APPLIED ELECTRICITY. 

 Sundry Electrical Appliances Mr. Edison's Inventions The Electric Light The 



Gyroscope A New Electrophorus Electric Toys 262 



CHAPTER XXIII. AERONAUTICS. 

 Pressure of Air in Bodies Early Attempts to fly in the Air Discovery of Hydrogen 



The Montgolfier Balloons First Experiments in Paris Noted Ascents ... 293 



CHAPTER XXIV. CHEMISTRY. 



What Chemistry is The Elements Metallic and Non-MetallicAtomic Weight- 

 Acids Alkalis Bases Salts Chemical Combination and Study 307 



CHAPTER XXV. CHEMISTRY (Continued). 

 Chemistry without a Laboratory ... 313 



CHAPTER XXVI. CHEMISTRY (Continued}. 

 Chemistry and Alchemy Chemical Combinations The Atmospheric Air 336 



CHAPTER XXVII. THE ELEMENTS. 

 Non-Metallic Elements 348 



CHAPTER XXVIII. NON-METALLIC ELEMENTS (Continued). 



Chlorine Bromine Iodine Fluorine Carbon Sulphur Phosphorus Silicon- 

 Boron Tellurium Arsenic 366 



CHAPTER XXIX. THE METALS. 



What Metals are Characteristics and General 1 Properties of Metals Classification 



Specific Gravity Descriptions 386 



