APPENDIX. 
and if the quantity of gold pleases them, take the gold and 
leave the salt; and in this manner they make their trade 
without seeing each other, by a long and ancient custom : and 
though it appears a hard thing to believe, I certify having had 
this information from many merchants, Arabs, and Azanaghi, 
and likewise from persons worthy of credit. 
No. VI. 
LIST OF IMPORTANT BOOKS RELATING TO AFRICA* 
^There are few ancient works relating exclusively to Africa, 
The following are the principal sources from which a know- 
ledge of its ancient state may be drawn. 
Herodotus, Historia. — iEgyptus et Ethiopia, lib. ii. et 
iii. princ. — Africa interior, lib. iv. 
Strabo. — Rerum Geographic, lib. xvii. in toto, lib. i. et 
ii. partim. 
Diodorus Siculus, Bibliotheca Historica— -iEgyptus,4ib. 
i. iEthiopia et Lybia, lib. iii, 
PToLEMiEUs. — Geographia, lib. iv. 
Plinius. — Histor. Natur. lib. v. cap. 1-8. 
Mela Pomp. — De situ Orbis, lib. iii. cap. 8, 9, 10. 
Hannonis, Periplus partium Lybicarum ultra columnas 
Herculis ap. Hudson. Geographi Graeci Minores, torn. ii. 
Sgylacis Caryandrii Periplus. Ib. p. 42-55. 
Arriani Periplus Maris Erythraei. Ibid. 
Agatharchides.— De Rubro Mari, Ibid. 
Modern Illustrations of the Ancient Geographi/ of Africa. 
Campomanes.— Antiguedad Maritimade Carthago, 8vo.— . 
A very learned work, containing a long discussion on the Pe* 
riplus of Hanno. 
