Excursions in Madeira and Porto Santo : during the autumn of 1823, while on his third voyage to Africa / by the late T. Edward Bowdich ; to which is added, by Mrs. Bowdich, I.A narrative of the continuance of the voyage to its completion ... II. A description of the English settlements on the river Gambia. III. Appendix: containing zoological and botanical descriptions, and translations from the Arabic