APPENDIX. 
359 
discoveries. La Barthe pubiished in 1802, La Navigation de la 
Jaille, in 178 1, from Cape Blanco to Sierra Leone. The African 
Society in London, has printed, since 1792, various v/orks contain- 
ing accounts of the enterprises executed by their agents, and their 
letters as well as those of its correspondents. Dr. Leyden compiled 
a History of the Discoveries in Africa ; a wew edition of which was 
published by Mr. Murray in 1817. 
Let us now show the result of the observations of all these 
travellers. 
The coast of Africa comprised between the limits we have 
mentioned, is flat and sandy ; the heights which form Cape de Verd, 
and some hills near Joal, alone break this uniformity, and the left, 
or southern bank of the river of Sierra Leone, presents a very 
considerable elevation, forming the prolongation of the mountains 
which extend from the interior. The whole country, proceeding 
from the sea to the east, presents three distinctly marked divisions. 
The first, which is thirty-five leagues broad opposite to Arguin, and 
which narrows to the south, until it terminates on the coast at 
Cachao, is composed of a flat and sandy soil, almost without stones ; 
this may be considered as the prolongation of the Sahara. The 
second, which is forty leagues wide, and ends at the mouth of the 
Rio Nunez, comprehends a soil which is half sandy, half argillaceous, 
very smooth, and almost without stones. The third extends as far 
as the first terrace of the mountains, is sixty leagues broad, the 
soil is argillaceous, hilly, and stony ; it terminates at the river of 
Sierra Leone. 
