We saw some hobaras, also a bird called getah, smaller than a partridge, something like a ptarmigan, with its summer feathers, and head shaped like a quail.  The Bey sent two live ones to R., besides a couple of large jerboahs of this part, called here, gundy.  They are much like the guinea-pig, but of a sandy colour, and very soft and fine, like a young hare.  The jerboahs in the neighbourhood of Tunis are certainly more like the rat.  The other day, near the south-west gates, we fell in with a whole colony of them—­which, however, were the lesser animal, or Jerd species—­who occupied an entire eminence to themselves, the sovereignty of which seemed to have been conceded to them by the Bey of Tunis.  They looked upon us as intruders, and came very near to us, as if asking us why we had the audacity to disturb the tranquillity of their republic.  The ground here in many places was covered with a substance like the rime of a frosty morning; it tastes like salt, and from it they get nitre.  Captain B. thinks it was salt.  The water which we drank was brought from Ghafsa:  the Bey drinks water brought from Tunis.  We marched across a vast plain, covered with the salt just mentioned, which was congealed in shining heaps around bushes or tufts of grass, and among which also scampered a few hares.  We encamped at a place called Ghorbatah.  Close to the camp was a small shallow stream, on each side of which grew many canes; we bathed in the stream, and felt much refreshed.  The evening was pleasantly cool, like a summer evening in England, and reminded us of the dear land of our birth.  Numerous plains in North Africa are covered with saline and nitrous efflorescence; to the presence of these minerals is owing the inexhaustible fertility of the soil, which hardly ever receives any manure, only a little stubble being occasionally burnt.

We saw flights of the getah, and of another bird called the gedur, nearly the same, but rather lighter in colour.  When they rise from the ground, they make a curious noise, something like a partridge.  We were unusually surprised by a flight of locusts, not unlike grasshoppers, of about two inches long, and of a reddish colour.  Saw also gazelles.  Halted by the dry bed of a river, called Furfouwy.  A pool supplied the camp:  in the mountains, at a distance, there was, however, a delicious spring, a stream of liquid pearls in these thirsty lands!  A bird called mokha appeared now and then; it is about the size of a nightingale, and of a white light-brown colour.  We seldom heard such sweet notes as this bird possesses.  Its flying is beautifully novel and curious; it runs on the ground, and now and then stops and rises about fifteen feet from the surface, giving, as it ascends, two or three short slow whistles, when it opens its graceful tail and darts down to the ground, uttering another series of melodious whistles, but much quicker than when it rises.