A journal comprising an account of the loss of the brig Commerce : of Hartford, (Con.) James Riley, master, upon the western coast of Africa, August 28th, 1815; also of the slavery and sufferings of the author and the rest of the crew, upon the desert of Zahara, in the years 1815, 1816, 1817; with accounts of the manners, customs, and habits of the wandering Arabs; also, a brief historical and geographical view of the continent of Africa /