IN CENTRAL AFRICA. 337 
joins the main stream at Isaca, twenty-seven leagues below, 
(forming the first or largest island, including Djenne) ; 
secondly, that near Galia, (or Cou Galia,) is another com- 
munication, having itself two branches, and forming a 
second or smaller island, of which Djenne occupies one 
extremity ; another channel also joins this island with the 
eastern branch. 
This description appears at first sight rather compli- 
cated, but its perplexity will be removed if tlie tracing 
dotted on the map be admitted. The eastern branch could 
not have been crossed by Mungo Park, and he knew 
nothing of it ; the same with Dochard. And, as for the 
second journey of Park, its narrative breaks off abruptly : it 
is probable that the branch which he followed in the first 
instance, on which Silla and six other villages beyond 
Sansanding are situated, is the same branch, which, ac- 
cording to M. Caillie, runs from Sego to Isaca; but Djenne 
must be carried to the right bank, whereas in the map of 
Park's travels it is placed on the left. This circumstance 
was already learned from Baron Roger* ; but the new 
discoveries perfectly explain this contradiction, which is 
merely apparent ; for if Djenne is on the right of the 
western branch, it is at the same time on the left of the 
eastern. 
This discussion shews that the immense volume of the 
waters of the Dhioliba is still greater than has been 
* Volume II of the Memoirs of the Geographical Society, page 54. 
VOL. II. Z 
