Figs. 1 to 8. Types from nature, illustrating development of a solar system from the attenuated matter of space Frontispiece. Fig. 9. A typical sun-spot 57 Fig. 10. Structure of the sun, analytical illustration of 60 Fig. 11. Electrical polarities of sun and planets 82 Fig. 12. Ideal view of the generation and transmission of planetary electricity 89 Fig. 13. The aurora borealis, view of 91 Fig. 14. Diffused brush discharge of an electrical machine 91 Fig. 15. Planetary generation and transmission of electrical energy to the sun, analytical illustration of 101 Fig. 16. Gradual discharge of electricity from one conductor to another in a partial vacuum 103 Fig. 17. Sudden electrical discharge through the atmosphere 103 Fig. 18. Position of planets with reference to the generation of sun-spots; maximum and minimum of electrical action 108 Fig. 19. Analysis of a typical sun-spot 112 Fig. 20. Retardation of sun-spots in their travel across the solar face; development to the rear and recession in front 114 Figs. 21 and 22. Complex lines of planetary electrical action upon the sun produced by the inclination of the solar axis to the plane of the ecliptic 120 Figs. 23 to 29. Examples of electrical repulsion: Fig. 1, similarly electrified pith-balls; Fig. 2, the electrical windmill; Fig. 3, repulsion of a flame; Fig. 4, self-repulsion around a conductor; Fig. 5, attraction between opposite and repulsion between similar electricities; Fig. 6, mutual repulsion between similar + electrospheres of the earth and the moon; Fig. 7, mutual repulsion between the similar--electrospheres of sun and comet 124 Figs. 30 to 34. Spectra of solar light, incandescent sodium and calcium, and the absorption and bright-line spectra of hydrogen gas 155 Figs. 35 to 37. Reversal and neutralization of spectroscopic lines of hydrogen in the light of a variable star like Betelgeuse 160 Fig. 38. A double-sun nebula in process of development into a solar system 164 Fig. 39. Double stars with complementary colors, interpretation of the phenomena of 167 Fig. 40. A solar system which would explain the regular