xl 
APPENDIX. 
This naturally leads me to the discussion of the position of Fort St. 
Joseph, as a point connecting the upper and lower part of the Senegal 
river : or in other words, the routes of the French, below, with those of the 
English, in the interior of the country. 
The French report concerning this position also points to an excess of 
distance from the westward ; even more than that arising from the difference 
between Mr. Park's reckoning and the reports of the merchants; for it 
• amounts to about 37 miles. 
Could it be ascertained that a measured survey of the Senegal river, to 
the height of Fort St. Joseph, had been taken, as Labat says (Vol. ii. p. 1 57.) 
was actually done, by the order of the Sieur Briie, this would settle the 
matter at once. But cursory surveys have so often been called actual and 
measured ones, that one must be in possession of better authority, before 
the survey of the Senegal river can be relied on, as an absolute measure of 
distance. Nor is there, in the list of places in the Con. de Temps, any inti- 
mation of the longitude of St. Joseph by triangles, or measurement. Here 
follows a statement of the means used in fixing the position of this place. 
M. D'Anville, in his map of the Senegal and Gambia rivers (1 751) places 
St. Joseph 7 0 44' east of Ferro, which being in 17 0 37' west of Greenwich, 
Fort St. Joseph should be in 9 0 53'. This is 32' to the west of the position 
arising on Mr. Park's route ; which gives 9 0 a'. But M. D'Anville sup- 
poses a difference of longitude of 6° 9' 15" only, between Fort St. Louis, 
at the mouth of the Senegal river, and Fort St. Joseph : and as I have 
followed M. Fleurieu's ideas in placing St. Louis in 16 0 8' longitude, St. 
Joseph of course falls in 9 0 59', rejecting the seconds; making a difference 
of 37 G. miles, or 38 min. from Mr. Park; that is, 13 miles more than 
the mean of the differences between the authorities for the position of 
Tombuctoo.* 
» It is proper to remark that M. D'Anville took the longitude of Cape Verd, i8f min. 
more to the east, in respect of Ferro, than M. Fleurieu : and Fort St. Louis more to the 
west in respect to Cape Verd, by fo| min. 
M. D'Anville moreover, allows no more than 3 0 2' 30" diff. Ion. between Pisania and 
Fort St. Joseph, which by the corrected distance of Mr. Park, is no less than 3 0 42'. 
