IN CENTRAL AFRICA. 305 
I may add that the same remark applies to the angular 
deviation. Indeed, considering the total distance between 
the meridian of Time and that of Fez, or the difference in 
longitude (which is equal to one degree forty four mi- 
nutes) as being the real sum of all the angles of the route 
to the east or west of the first, it will follow that the 
forming of the lines of bearings noted by the traveller 
(or the calculation of the angles, which is more exact) 
gives a total variation, so much nearer to the above diffe- 
rence of longitude as the number of bearings is greater ; 
and this number is also six hundred and thirty three. As 
it has been seen above, I have found the deviation equal 
to less than six degrees, and it has been easy to divide 
it over the whole line. 
VOL. II. 
X 
