African Memoranda; relative to an attempt to establish a British Settlement on the Island of Bulama, on the Western Coast of Africa, in the year 1792, with a brief notice of the Neighbouring Tribes, Soil, Productions, &c., and some Observations on the facility of Colonizing that part of Africa, with a view to Cultivation and the Introduction of Letters and Religon to its Inhabitants, but more particularly as the means of gradually abolishing African Slavery