of the Sun and a small Spot

43 17. The Prism 45 18. Dispersion of Light by the Prism 46 19. Prominences seen in Total Eclipses 53 20. View of the Corona in a Total Eclipse 62 21. View of Corona during Eclipse of January 22, 1898 63 22. The Zodiacal Light in 1874 69 23. Comparative Sizes of the Earth and the Moon 73 24. The Moon's Path around the Sun 76 25. The Phases of the Moon 76 26. The Earth's Shadow and Penumbra 78 27. Key to Chart of the Moon (Plate VI.) 81 28. Lunar Volcano in Activity: Nasmyth's Theory 97 29. Lunar Volcano: Subsequent Feeble Activity 97 30. Lunar Volcano: Formation of the Level Floor by Lava 98 31. Orbits of the Four Interior Planets 115 32. The Earth's Movement 116 33. Orbits of the Four Giant Planets 117 34. Apparent Size of the Sun from various Planets 118 35. Comparative Sizes of the Planets 119 36. Illustration of the Moon's Motion 130 37. Drawing an Ellipse 137 38. Varying Velocity of Elliptic Motion 140 39. Equal Areas in Equal Times 141 40. Transit of the Planet of Romance 153 41. Variations in Phase and apparent Size of Mercury 160 42. Mercury as a Crescent 161 43. Venus, May 29, 1889 170 44. Different Aspects of Venus in the Telescope 171 45. Venus on the Sun at the Transit of 1874 177 46.