Cassini

7. Autolycus

8. Aristillus

9. Archimedes

10. Timocharis

11. Lambert

12. Euler

13. Sea of Showers

14. Aristarchus

15. Herodotus

16. Ocean of Storms

17. Copernicus

18. Apennine Mountains

19. Sea of Serenity

20. Haemus Mountains

21. Sea of Conflicts

22. Proclus

23. Sea of Tranquillity

24. Sea of Fertility

25. Hevel

26. Kepler

27. Grimaldi

28. Flamsteed

29. Bonpland

30. Gassendi

31. Sea of Vapours

32. Hipparchus

33. Albategnius

34. Ptolemaeus

35. Alphonsus

36. Arzachel

37. Theophilus

38. Cyrillus

39. Catherina

40. Sea of Nectar

41. Langrenus

42. Vendelinus

43. Petavius

44. Schickard

45. Wargentin

46. Tycho

47. Maurolycus

48. Clavius

49. Newton

50. Straight Wall

51. Sea of Moisture

52. Sea of Clouds]

Proceeding on our tour of inspection, we crossed the Ocean of Storms to
a point near the central part of the lunar surface, and I showed them
the fine walled plain called Ptolemaeus. This is 115 miles in diameter,
and contains an area as large as the combined areas of Yorkshire,
Lancashire, and Westmorland, its highest peak being 9000 feet in
altitude. It forms the most northerly of a line of walled plains, the
most southerly being Arzachel, which is sixty-six miles in diameter, and
has a very depressed floor; while one peak on the walls rises to a
height of 13,000 feet.

Passing farther west, we next examined another splendid group of three
ring-mountains, arranged in a line running nearly north and south, viz.
Theophilus, Cyrillus, and Catherina. The first is the most northerly,
and is about sixty-four miles in diameter, with several very high
peaks--one rising as much as 18,000 feet, and two on the opposite side
being 16,000 and 14,000 feet high respectively. Even the central
mountain is very large in area, and 6000 feet high. "That," I remarked
to M'Allister, "is nearly half as high again as Ben Nevis, the highest
mountain in Scotland, which is, after all, only 4400 feet high."

"Ben Nevis, Professor, is 4406 feet high!" corrected M'Allister.

"That's right, M'Allister," said John, clapping him on the back, "stick
up for bonnie Scotland, and don't let her be robbed of that six feet of
mountain!"

Proceeding, I then said that Cyrillus, the middle ring, was, as they
could see, very irregular in shape; and the walls were in some parts
very much broken and damaged.

Catherina is the la