18. Triple star [xi] in Cancer 72

19. Quadruple star [epsilon] of the Lyre 73

20. Sextuple star [theta] in the Nebula of Orion 74

21. The Star-Cluster in Hercules 79

22. The Star-Cluster in the Centaur 80

23. The Nebula in Andromeda 81

24. Nebula in the Greyhounds 82

25. The Pleiades 83

26. Occultation of the Pleiades by the Moon 85

27. Stellar dial of the double star [gamma] of the Virgin 86

28. Comparative sizes of the Sun and Earth 93

29. Direct photograph of the Sun 96

30. Telescopic aspect of a Sun-Spot 97

31. Rose-colored solar flames 228,000 kilometers (141,500
miles) in height, _i.e._, 18 times the diameter of the
Earth 103

32. Orbits of the four Planets nearest to the Sun 115

33. Orbits of the four Planets farthest from the Sun 116

34. Mercury near quadrature 117

35. The Earth viewed from Mercury 119

36. The Evening Star 123

37. Successive phases of Venus 124

38. Venus at greatest brilliancy 126

39. The Earth viewed from Venus 130

40. Diminution of the polar snows of Mars during the
summer 136

41. Telescopic aspect of the planet Mars (Feb., 1901) 137

42. Telescopic aspect of the planet Mars (Feb., 1901) 138

43. Chart of Mars 140

44. The Earth viewed from Mars 144

45. Telescopic aspect of Jupiter 150

46. Jupiter and his four principal satellites 155

47. Saturn 159

48. Varying perspective of Saturn's Rings, as seen from
the Earth 161

49. The Great Comet of 1858