CONTENTS. XV 



ELECTRICITY AND MAGNETISM. 



1. Frictional Electricity. 



ARTICLE PAGE 



44. Electrical Attraction and Kepulsion. Conductors and Non-con- 



ductors 551 



45. Induction. The Electroscope. The Electrophorus . . . 562 



46. Distribution of Electricity upon Conductors. Electrical Machine 584 



47. Condensers of Electricity. Effects of Electrical Discharge . 611 



2. Contact-Electricity. 



48. Contact-Electricity. Galvanic Element. Galvanic Current . . 647 



49. Effects of the Galvanic Current upon Conductors . . . 668 



50. Action of Galvanic Currents upon each other. Ampere's laws . 693 



3. Electro-magnetism. Magnetism. Induction ~by Currents. 



51. Electro-magnetism 700 



52. Magnetism 735 



53. Induction of Currents . . . . . . . 748 



HEAT. 



54. Expansion by Heat. The Thermometer 756 



55. Melting and Freezing ........ 786 



56. Evaporation, Ebullition, and Condensation of Vapour . . . 792 



57. Transmission of Heat. Radiation. Conduction . . . 809 



58. Specific and Latent Heat 816 



59. Means of raising and lowering the temperature of bodies . . 826 



INDEX 841 



LIST OF TOOLS, ETC 849 



