GREAT ROCK MOURZUK CIRCULAR. 113 
Chintagawna this morning. And oh, most gracious 
God ! give us a prosperous journey, and may we be 
useful to ourselves and our fellow-creatures. 
We started about eleven o'clock, and went on 
about three hours and a-half. The day was very 
-cool ; the thermometer in the morning, at sunrise, 
being only three degrees above the freezing-point. 
We expect to see the water freeze on the high plains 
through which we are about to pass, before arriving 
at Damerghou. Our encampment is a pleasant 
wady, under a conical-formed rock of considerable 
elevation, perhaps 1500 feet. We are also in a high 
situation, some 1000 or more feet above the level of 
the sea. There is near this rock a lower one of an 
oblong form, its sides fluted with pillars ; these 
columnar masses are basalt. Dr. Overweg examined 
the rocks, and found the outer crust a new species 
of rock, a sort of tractate or brachite ; and the 
interior a sort of basalt, or volcanic substance. The 
large rock is also of the same formation. Dr. Barth 
ascended the large rock. 
I am now told that I made a great mistake 
about the wording of the circular letter of Mus- 
tapha Bey. This letter begins by thanking the 
Tuaricks of Aheer for exterminating the Walad 
Suleiman! It then hints broadly at the necessity 
for the Turks in Mourzuk and the Tuaricks of 
Aheer being friends ; and to maintain this friendship 
one important condition is required — that they, the 
Tuaricks of Aheer, shall protect all the merchants 
VOL. II. I 
\ 
