16|11.2 | 25 |57.¼ | 88.¼ | 58 | 51 |West. 17|10.4 | 27 |55.½ | 92.¾ | 57 | 52 | 18|14.2 | 29 | 64 | 97.¼ | 51 | 50 |East. 19| 14 | 31 |63.½ |101.¾ | 51 | 51 | 20| 11 | 30 |56.¾ | 99.½ | 57 | 58 | From this time until the third of December Belford and I were confined to our beds. December 4|10.2 |22.4 | 55 | 82.½ | 54 | 52 |Westerly. 5|11.4 |27.2 |57.½ | 93.¼ | 58 | 54 |West. 6| 9.2 | 25 |52.¾ | 88.¼ | 59 | 58 | 7| 8.5 | 22 | 51 | 81.½ | 58 | 60 |North. 8|11.2 | 25 |57.¼ | 88.¼ | 61 | 54 |North-west. 9| 10 | 27 |54.½ | 92.¾ | 58 | 51 | 10|12.2 | 26 |59.½ | 90.½ | 51 | 51 |East. 11| 11 | |56.¾ | | 53 | | 12| 10 |25.2 |54.½ | 88.¾ | 56 | 50 |East-north-east. 13| 9.5 | 20 |53.¼ | 77 | 59 | 52 |North. ------------+-----+-----+-----+------+-----+-----+------------------ [*: Fevers very prevalent, and often fatal.] We set out at this time on our journey to the south; for account of Thermometer see Journal. OBSERVATIONS. I here subjoin a short account, by Professor Buckland of Oxford, of a few specimens of the rocks and minerals of Tripoli and Fezzan, which I was enabled to collect in the course of my tour. It appears to Mr. Buckland, from these specimens, that the kingdoms of Tripoli and Fezzan present, in their geological structure, a striking resemblance to the rocks of Europe; and are composed of strata, which are distinctly referrible to the three following formations: 1. _Basalt._ 2. _Tertiary Limestone, of nearly the same age with the Calcaire Grossier of Paris._ 3. _New Red Sand Stone._ 1. The Basaltic Rocks appear to constitute the great chain of the Soudah or Black Mountains, near the northern extremity of the kingdom of Fezzan, not far from Sockna; they extend in breadth nearly 100 miles from north to south, and run as far as the eye can reach from east to west. 2. The Tertiary Limestone, or Calcaire Grossier, containing marine shells in a state of delicate preservation, is found in Tripoli, on the two opposite edges of the desert that lies between the town of Benioleed and castle of Bonjem, and appears to be of the same age and formation with depositions of a similar kind that occur in Malta and Sicily, and on the north side of the Mediterranean, on the coasts of Italy and France. 3. The New Red Sand Stone formation appears under its usual form of loose red sand, accompanied by salt and gypsum, and associated with beds of a calcareous breccia, cemented by magnesian limestone, and with beds of compact dolomite. There are no primitive rocks, and one specimen only which seems referrible to a granular quartz rock, more ancient than the new red sand stone.