V1 ii TABLE OF CONTENTS. 



PHYSICS I !' THE <!.< i;i: -Continued. 



Chemical and Physical Properties of the Air Page 157 



Temperature 162 



Movements of the Atmosphere l''<* 



Barometric Pressure 171 



Evaporation and Precipitation 174 



Storms 177 



Atmospheric Electricity 184 



< Optical Phenomena 188 



Miscellaneous Relations and Applications 190 



Sunspot Periods 190 



Health 194 



Hypsometry 198 



Physical < Geography and Geology 200 



Botany and Zoology 201 



Refraction of Light and Sound 204 



Pneumatics and Aeronautics 206 



Meteors and Zodiacal Light 209 



PHYSICS. By George F. Barker, Professor of Physics in the University 



of Pennsylvania, Philadelphia 211 



General 211 



Mechanics 213 



1. Of Solids 213 



2. Of Liquids 215 



3. Of Gases 218 



Acoustics 219 



1 1 eat 22G 



1. Thermometry and Change of State 227 



2. Conductivity and Radiation 232 



3. Specific Heat and Thermodynamics 233 



Light: 



1. Reflection and Refraction 235 



2. Dispersion 230 



::. [nterference and Polarization 242 



ElECTRN 1 IV : 



1. Magnetism 214 



2. Electromotors 240 



.". Electrical .Measurements 250 



I. Electric Spark and Lighl 253 



5. Telephone _ 254 



CHEMISTRY. By Gi orge F. Barker, Professor of Physics in the Uni- 

 versity of Pennsylvania, Philadelphia . . 257 



Gekerai 257 



Non-Metallic 95g 



