IN CENTRAL AFRICA. 
315 
At St. Louis, 
At St. Mary, 
At Cape Roxo, 
idem 
Maritime Annals*. 
M. le Predour.f 
170 32E.declin. 
17 25 
17 20 
In Mungo Park's journal of his second expedition, 
as printed in London, is a tracing of the Gambia, J from 
which a smaller declination would result : it appears evi- 
dent to me, that some error has crept in here, either in 
the copying or in the engraving, when the coincidence of 
the preceding observations from five different travellers is 
considered, and particularly that of Park's own obser- 
vations. § To these might be added the declination 
observed by Major Laing in his first journey, and that 
which has been observed at Sierra-Leone and other 
places ; but this inquiry would be superfluous. It will 
be remarked, that the mean term of 16^ 55' declination 
east, is also the mean between the two observations of 
M. Caillie ; but, as the observation of Badoo seems rather 
small compared with all the others, I have thought myself 
entitled to adopt 17^ as the mean declination and to sub- 
ject the whole route to it. 
* Annales Maritimes for the year 1827, second part, vol. ii, p. 276. 
t Ann. Marit. for the year 1828 ; second part, vol. i, pages 933 
and 941. 
X The Journal, &c. p. 21. 
§ M, de Beaufort has made, at Senegal, two observations which 
differ from the above by more than 5°, and others which exceed from 
2 to 5 degrees : this variation is, no doubt, owing to local cir- 
cumstances. 
