Executed Under the Orders of the British Government, in the Years 1809 and 1810 : in which are Included, an Account of the Portuguese Settlements on the East Coast of Africa, Visited in the Course of the Voyage : a Concise Narrative of Late Events in Arabia Felix, and Some Particulars Respecting the Aboriginal African Tribes, Extending from Mosambique to the Borders of Egypt : Together with Vocabularies of Their Respective Languages, Illustrated with a Map of Abyssinia