308 REMARKS ON TRAVELS 
computation of M. Caillie, who at first estimated the whole 
route equally at three miles. Now the line of route thus 
constructed and resting upon Arbate, a well known po- 
sition, carries Timbuctoo very near the eighteenth degree 
north; that is to say, from 17" 50' to 17^55'; had not 
this been shortened a little, the city would have been 
carried to 19% or 20*', a position far too northerly, and 
totally inadmissible. Moreover, the line from Timbuc- 
too to Arbate would be ten degrees too far west; it 
would also be increasing the declination to 27^ instead 
of 17% which seems to be its amount for the mean 
meridian. 
But, if the bearing of the line from Timbuctoo to 
Fez resulting from the itinerary, and that of the line from 
Time to Timbuctoo, are preserved, these two intersect 
each other about the parallel of 17" 50'. This latitude 
agrees so well with that resulting from the height of the 
shadow, 17" 51' that we derive from these data a very 
satisfactory confirmation. Now the line of the parallel 
17" 51' and the two lines of direction meet, all three, 
on nearly the same meridian, the sixth west from Paris. 
No positive data are yet known which can better 
fix the longitude : not only are the itineraries of the 
Moors too vague, but they support themselves upon the 
Mediterranean, while M. Caillie's routes, though they 
are continued to the Mediterranean, support themselves 
upon the ocean ; which is much nearer than the former, 
and also upon the known positions of Timbo and Fez. 
