IN the autumn of 1852, through the medium of my excellent friend, the late General Monteith, I offered my services to the Royal Geographical Society of London, for the purpose of removing that opprobrium to modern adventure, the huge white blot which in our maps still notes the Eastern and the Central regions of Arabia. Sir Roderick I. Murchison, Colonel P. Yorke and Dr. Shaw, a deputation from that distinguished body, with their usual zeal for discovery and readiness to encourage the discoverer