IN CENTRAL AFRICA. 311 
observation, as communicated to me by Captain Sabine, 
is very different, namely : 29' west of Paris, and 27*^ 
11' 30". M. Walckenaer has calculated the distance 
from this oasis to Timbuctoo at six hundred and seventy 
five geographical miles : it is evident that this measure, 
if admitted, would advance Timbuctoo towards the north 
to between the 17th and 18th degree; now, it happens 
that this distance of six hundred and seventy five miles 
is found exactly between the two points as placed upon 
the present map. This last coincidence, which I re- 
marked after my labour was concluded, contributed 
still farther to dispel my doubts. I have estimated the 
day's journeys at 18' four tenths and not with M. 
Walckenaer at 15' ; but it was the medium journeys, 
not those of the great caravan, which formed the object 
of his researches. It appears then that the approx- 
imative situation assigned to Timbuctoo, 6"^ west and 
17^ 50' north, satisfies the different data, and the best itine- 
raries, that it agrees with the positions of Timbo and of 
Fez, and that it is not contradicted by Mungo Park's 
observations on the latitude, taken at Sami and Yami- 
na ; finally, it is confirmed by the particulars brought 
from Elimane by Captain Beaufort. 
Fifty four days' journeys will be found on my map 
from Timbuctoo to Tatta; an itinerary cited by M. 
Walckenaer (p. 297) marks fifty. The fifty four days 
from Fez to Timbuctoo according to Mr. Jackson* also 
* " An Account of the Empire of Morocco/' p. 240. 
