672 ME. G. F. SCOTT ELLIOT AND DE. J. W. GEEG0ET [Nov. 1 895, 



been intensely altered and consists o£ quartz, decomposed felspar, 

 and chlorite. In places, as at the entrances to the Kivata and 

 Butanuka valleys, the foliation becomes obscure. Following up 

 the Kivata valley we come, at the level of 5600 feet, to a weathered 

 foliated epidiorite [105]. At the levels of 6700 and 6800 feet 

 there occurs a series of hornblendic schists interstratified with 

 coarser gneissose rocks, which become in places syenitic gneisses. 

 The hornblendic schists are succeeded in turn by a thick series of 

 weathered, fairly coarse, and often much altered and decomposed 

 gneissoid mica-schists [100 & 121] which extend up the mountain- 

 face from 6900 to 9000 feet. There a banded epidiorite re-appears. 

 A little farther up, at the highest point reached on this side, is a 

 rock which, so far as the specimen available [107] allows us to 

 judge, is a coarse pegmatite-dyke. 



(2) The Yeria Section. 



The second section up the eastern face of Ruwenzori was made 

 a little farther south, along the valley of the Yeria, a tributary of 

 the Wimi, a river which flows into the northern end of Lake 

 Ruisamba. The section begins at the same level as the last 

 (5200 feet), in the gneiss series of the district around Kasagama's. 

 At the foot of the eastern slope, at the level of 6000 feet, the 

 schist series is met with, and is here represented by a well-cleaved 

 chloritic schist [103]. This is associated with rocks of which two 

 different types are included in the collection. One [116] from the 

 height of 6300 feet is a gneissoid schist containing quartzose 

 felspathic nodules, though the specimen is too small to enable us 

 to express a definite opinion as to its character. The other is a 

 fine-grained, irregularly gneissoid syenite [104], which probably 

 represents what was originally a series of intrusive dykes. Farther 

 up the mountain-side, at the height of 8000 feet, another type of 

 rock is met with : this [112] is a well-foliated hornblendic gneiss of 

 medium grain. At 9000 feet occur soft, weathered mica-schists 

 [117], while interbedded either in this or in the gneiss is a sheet 

 of black, hard, massive epidiorite [108]. This rock does not, 

 however, appear to constitute the mass of Ruwenzori ; for still 

 higher and nearer the central axis of the range we come to the 

 weathered mica-schists, at 9800 feet, and a little higher yet there 

 follows a hornblendic gneiss, which here appears to form the central 

 axis of the chain. 



(3) The Nyamwamba and Butagu Sections. 



The last section described is of interest, as it reached the central 

 axis of that part of the Euwenzori ridge, which is there 11,000 feet 

 in height. The third section is on the flanks of the highest part 

 of tbe ridge, and both slopes are included, though unfortunately 

 the summit was not itself reached. This attains here the height of 



