IN CENTRAL AFRICA. 291 
Africanus ? but his description suits this no better.* 
In this case Gualata would be much farther to the south than 
is generally supposed. It is however certain that geographers 
cannot confound the Walet of MungoPark with Gualata. 
Although M. Cailli^ has not mentioned Agably which 
is believed to be the chief place of the oasis of the 
Touats^ I have been obliged to insert it in the map, 
because the traveller gives a position called Touat much 
nearer to the route from Timbuctoo to the Tafilet. It is 
not surprising that several places should be so called, 
because the wandering tribe bearing this name occupy 
a considerable portion of the great desert, from the south 
of Morocco to beyond Agably. Besides, the situation 
of this place, which could not have been brought within 
the limits of the map, if we were to adopt the mere 
reports of the Arabs, to which geographers have had 
recourse, falls there, on the contrary, according to the 
astronomical observation of Major Laing, who fixes it 
much farther to the west. This observation is published, 
for the first time ; I owe it to my learned friend Captain 
Sabine, himself united in the most affectionate intimacy 
with the unfortunate traveller, who transmitted it to him 
after sustaining a first attack on leaving this oasis. Nor 
was it at Agably that Major Laing made the observation, 
* About 300 miles south of Nun, 500 north of Tumbut, and 
100 from the Ocean : it is evident that no point can fulfil all these 
conditions. 
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