The Mission will be conveyed to Aden in the Honourable Company's steam frigate Auckland, now under orders to leave Bombay on the 27th instant; and it has been arranged that one of the Honourable Company's vessels of war, at present in the Red Sea, shall be in readiness to convey the Mission thence to Tajura, at which latter place it should immediately disembark, and commence its journey to Ankober. (Signed) J.P. Willoughby, Secretary to Government. To Captain W.C. Harris, Corps of Engineers. The Embassy was thus Composed: Captain W.C. Harris, Bombay Engineers. Captain Douglas Graham, Bombay Army. Principal Assistant. Assistant-Surgeon Rupert Kirk, Bombay Medical Service. Dr J.R. Roth, Natural Historian. Lieutenant Sydney Horton, H.M. 49th Foot,--as a Volunteer. Lieutenant W.C. Barker, Indian Navy. Assistant-Surgeon Impey, Bombay Medical Service. Mr Martin Bernatz, Artist. Mr Robert Scott, Surveyor and Draftsman. Mr J. Hatchatoor, British Agent at Tajura. Escort and Establishment:-- Two sergeants and fifteen rank and file; volunteers from H.M. 6th Foot, and from the Bombay Artillery. An Assistant Apothecary. Carpenter. Smith. Two Tent Lascars. INTRODUCTION. Written in the heart of Abyssinia, amidst manifold interruptions and disadvantages, the following pages will, in many respects, be found imperfect. Their chief recommendation must be sought in the fact of their embodying a detail of efforts zealously directed, under the auspices of a liberal Government, towards the establishment of a more intimate connexion with a Christian people, who know even less of the world than the world knows of them,--towards the extension of the bounds of geographical and scientific knowledge, the advancement of the best interests of commerce, and the amelioration of the lot of some of the least favoured portions of the human race. An obvious necessity for the introduction of the foregoing extract from his instructions will exonerate the Author from an intention to appropriate as his due the very gratifying encomium passed upon his previous exertions in Southern Africa. As a public servant, the freedom of his pen has now in some measure been curtailed; but his official position and resources, added to the able assistance placed at his command, have, on the other hand, extended more than commensurate advantages. To Captain Douglas Graham, his accomplished and early friend, and principal assistant, he acknowledges himself most especially indebted, for the aid of a head and of a pen, such as are not often to be found united. The exertions of Assistant-Surgeon Kirk alleviated incalculable human suffering; and his perseverance, although long opposed by an unfavourable climate, carried through a series of magnetic and astronomical observations of the highest importance to Abyssinian geography.