This celebrated treatise details Maxwell's theory of electromagnetism which underpins much modern physics. The theory elaborated here inspired both Lorentz's theories on the electron and Einstein's theory of relativity. This volume copntains Parts III and IV of the treatise dealing respectively with magnetism and finally with electromagnetism itself.

Part 3: Magnetism 1. Elementary theory of magnetism 2. Magnetic force and magnetic induction 3. Magnetic solenoids and shells 4. Induced magnetization 5. Particular problems in magnetic induction 6. Weber's theory of induced magnetism 7. Magnetic measurements 8. On terrestrial magnetism Part 4: Electromagnetism 1. Electromagnetic force 2. Amperes investigation of the mutual action of electric currents 3. On the induction of electric currents 4. On the induction of a current on itself 5. On the equations of motion of a connected system 6. Dynamical theory of electromagnetism 7. Theory of electric circuits 8. Exploration of the field by means of the secondary circuit 9. General equations of the electromagnetic field 10. Dimension of electric units 11. On energy and stress in the electromagnetic field 12. Current-sheets 13. Parallel currents 14. Circular currents 15. Electromagnetic instruments 16. Electromagnetic observations 17. Comparison of coils 18. Electromagnetic unit of resistance 19. Comparison of the electrostatic with the electromagnetic units 22. Electromagnetic theory of light 21. Magnetic action on light 22. Ferromagnetism and diamagnetism explained by molecular currents 23. Theories of action at a distance

James Clerk Maxwell , late Professor, Trinity College, Cambridge