Four Lectures from a Huntington Library Manusript.  Edited by John Hayman.   
First paperback printing  2005.   In 1866, while serving as British consul in Brazil, Burton presented 4 lectures on his travels to Medina, Mecca, Harare and Dahomey.   Disguised to the point of undergoing circumcision to appear as an Islamic pilgrim,  is an example of Burton's 
fascinating journal entries.  As new.