680 THE GEOLOGY OF MOUNT RUWENZORI. [Nov. 1 895.. 



mens and making very insufficient field- notes. The level to which 

 glaciation had occurred — that is, if it really did occur, for he was by 

 no means certain on the point — was about 5200 feet in all the three 

 valleys. The present snow-line is 15,000 feet at lowest, and this 

 seems at first sight to be an enormous difference. The mountain 

 may, however, have been once very much higher. The interesting 

 point in African geology would be to know in what condition the 

 Sahara was in Miocene times : his experience in botany was that 

 one might roughly divide the whole flora of Africa into two parts 

 by a line passing along B/uwenzori from the Abyssinian mountains, 

 by the east of Tanganyika and the Stevenson Road to Angola. In 

 view of this fact, Dr. Blan ford's remarks were of the very greatest 

 interest. He was very grateful to Dr. Gregory for the great care 

 and thoroughness with which he had worked out his collection. 



He also mentioned that Capt. Lugard appears to have discovered 

 the recent volcanic cones near Kuwenzori as well as crater-lakes on 

 the eastern side of the Albert Edward Nyanza, though this is not 

 very clearly put in his work. 



Dr. Gregory remarked that the collection from Buwenzori did not 

 contain a definite plutonic rock, though one might ultimately be 

 found. There was no evidence of the former extension of the 

 glaciers of Kilimanjaro, and he had searched in vain for evidence 

 of such on mountains a little over 10,000 feet in height. It was 

 only "where this level was much exceeded, so that great snow-fields 

 existed, that the glaciers ran to lower levels. 



