ON ITS EXTERIOR. VOLCANOES. 333 



A volcano ? is believed to be a little to the west of 

 the snow-covered mountain Keenia, in Eastern Africa, 

 in about 1 20' S. latitude, found in 1849, by the 

 missionary Krapf, near the sources of the Dana Eiver, 

 about 320 geographical miles north-west of the sea- 

 coast near Mombas. In a parallel nearly 2 more 

 southerly there is another snowy mountain, Kilimand- 

 jaro, discovered in 1847 by the missionary Eebmann, 

 scarcely 200 miles from the same coast. Eather more 

 to the west there is a third snowy mountain, Doengo 

 Engai, which was seen by Captain Short. The know- 

 ledge of the existence of these mountains has resulted 

 from courageous and perilous undertakings. 



Proofs of prehistoric volcanic activity in the interior 

 of this great continent, but which has been so little 

 explored between the parallels of 7 N. and 12 S. 

 latitude, (those of Adamowa and the water dividing Lu- 

 balo mountains,) are presented (according to Euppell) 

 by the country round Lake Tzana, in the kingdom of 

 Grondar, as well as by the basaltic lavas, trachytes, 

 and obsidians of Shoa, according to Eochet d'Hericourt ; 

 the specimens brought home by the last-named traveller 

 have been examined by Dufrenoy, and found very 

 analogous to those of the Cantal and Mont Dore. 

 (Comptes Eendus, t. xxii. p. 806 810.) If the conical 

 mountain Koldghi in Kordofan has not shown itself to 

 be still active, yet the existence of black, porous, 

 vitrified rocks there has been confirmed. ( 479 ) 



In Adamowa, south of the great Binue river, rise the 

 isolated mountain-masses of Bagele and Alantika, 

 which Dr. Barth, in his journey from Kuka to Jola, 

 judged by their cone and dome-shaped form to be 



