284 REMARKS ON TRAVELS 
of our indefatigable traveller, when the use that I 
have made of them may be judged of. M. Caillie pre- 
sumes the island of Djenne to be eighteen miles in cir- 
cumference 5 but the construction of the route and the 
general appearance of the map induce me to believe that 
it is of greater extent : I also suspect, that the junction 
of the island with the western branch of the river cannot 
be seen from Djenne, but only its junction with the 
eastern branch ; this would be a natural consequence of 
the westerly situation of Sego, with regard to Djenne. 
For the rest, I refer to the observations in the following 
article, that this discussion may not be prolonged here* 
I shall not stay to inquire how it happened that 
Mungo Park knew nothing of a second branch of the 
river, when he proceeded from Sego to Silla. I shall 
likewise abstain from entering into further developments 
respecting the course of the Dhioliba beyond Djennd. 
The narrative furnishes ample details, not less instruc- 
tive than new, respecting the course of the river, its 
depth, its immense width in some parts, to the extent 
of half or even a whole mile. One of the most inter- 
esting points of this route by water is the great lake 
Debo, or Dhiebou, which M. Caillie met with half-way 
between Djenne and Timbuctoo. 1 cannot help thinking 
that this lake is the same which figures on the maps 
under the name of Dibbie, but with a widely different 
position, form, and extent. 
The enthusiasm of our traveller at the sight of this 
