I. Introduction An interesting account of a journey into Southern Abyssinia was given in the Journal of the Royal Geographical Society for 1900, by Mr. H. Weld Blundell. He followed a route roughly westward from Berbera through Somaliland and Southern Abyssinia, then turned northward to the Blue Nile and into the Sudan. On this expedition Dr. R. Kœttlitz collected a large number of rock-specimens which (at the kind suggestion of Mr. Teall), together with some obtained by Lord Lovat, were entrusted to me for description. The absence of the former on the Antarctic Expedition makes it impossible to submit these notes to him for revision. But the following brief statement is condensed from a topographical sketch which he posted to me from the ship Discovery at Lyttelton (New Zealand) in the spring of 1902, and a more general account by him will be found printed as an appendix to Mr. Blundell's paper mentioned above. A map of the route was published with that paper, from which I have copied the spelling for the place-names, where possible. I have identified a few other localities on the British War Office map of the district, but the remainder had to be taken from the rough pencil-labels. The expedition crossed the coastal plain from Berbera, passing knoll-like isolated hills, the road gradually rising to the edge of the plateau, where the shattered rocky ground often exposed schistose and granitic masses. Overlying these, sedimentary beds and volcanic rocks were seen in places, and occasionally flat-topped