Telescope 11

2. Dome of the South Equatorial at Dunsink Observatory, Co. Dublin 12

3. Section of the Dome of Dunsink Observatory 13

4. The Telescope at Yerkes Observatory, Chicago 15

5. Principle of Herschel's Reflecting Telescope 16

6. South Front of the Yerkes Observatory, Chicago 17

7. Lord Rosse's Telescope 18

8. Meridian Circle 20

9. The Great Bear 27

10. Comparative Sizes of the Earth and the Sun 30

11. The Sun, photographed September 22, 1870 33

12. Photograph of the Solar Surface 35

13. An ordinary Sun-spot 36

14. Scheiner's Observations on Sun-spots 38

15. Zones on the Sun's Surface in which Spots appear 39

16. Texture 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. " " 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