Xli PREFACE 



for his hospitality and assistance before we began and after we 

 returned from our long expedition; to the alas! since deceased 

 Mr. William Oswald, then Consul in Zanzibar, whose influence 

 and experience were ever at our service and of the greatest 

 assistance to us ; to the then Assistant Eesident in Aden, Lieu- 

 tenant-Col. Fred. M. Hunter, and Dr. Gregory d'Arbela in Zan- 

 zibar, for their ready co-operation ; and last, not least, to the 

 Lloyd's East African Steamship Company for the many privi- 

 leges accorded by them to us in the transport of our stores, &c, 

 from Trieste to Aden. 



To which I must add nry own deep personal gratitude to 

 Messrs. A. Mielichhofer and Ludwig Hans Fischer, to whose 

 disinterested and unremitting co-operation I owe the greater 

 number of the illustrations in these two volumes. 



THE AUTHOE. 



Vienna : May 1892. 



