XXXV.] THE KILIMACHIO HILLS. 465 



dip of the strata, for the country on the left bank stretches back 

 for miles, and rises very gradually, while the right side is in 

 many places bordered by cliffs. On the face of these cliffs are 

 often to be seen numerous small strata of shaly sandstone, and 

 in some places are curious round marks exactly like those caused 

 by a round-shot striking brick-work too solid for it to breach. 



Beyond the Lualaba and all along near the Lomami the coun- 

 try is generally level, with deep gulches grooved out by the in- 

 numerable streams, the sides showing more water-worn pebbles, 

 sand, and a light yellow sandstone resting on the granite. 



The Kilimachio hills are the commencement of a system of 

 rocky hills composed of granite, gneiss, and a pecuhar sort of 

 vesicular rock, with occasional small pieces of granite imbed- 

 ded in it, which had the appearance of being the granite re- 

 ally melted, and not simply metamorphosed by heat. It did 

 not look like lava or slag, though no doubt somewhat' of this 

 nature. 



These hills are the western extremity of the " Mountains of 

 Rua," which Livingstone mentions as damming in the northern 

 part of Lake Moero, and are also the same range tliat turns back 

 from Lake Tanganyika, at Eas Mulango, to the south of the 



Lukuga. 



It will be well here to trace the affluents of the Lualaba. 

 The one that extends farthest west, and which, except for rap- 

 ids, might be navigable to within one hundred and fifty miles 

 of the Nyassa, is the Chambezi, the principal feeder of Lake 

 Bangweolo. From this lake it issues as the Luapula, and, flow- 

 ing past the town of Ma Kazembe, is the chief supply of Lake 

 Moero. From Moero it bursts through the mountains of Eua, 

 and is then known by the natives as the Luvwa, though the 

 Arabs call it Lualaba, and Dr. Livingstone adopted that name 

 from them. Between the lakes Moero and Lanjl it joins with 

 the Lualaba proper, which is the central and lowest line of 

 drainage. 



The Lualaba rises near the salt marshes of Kwijila, and, flow- 

 ing through Lake Lohemba, makes a considerable drop before 

 entering Lake Kassali or Kikonja. Into Lake Kassali also flows 

 the Lufira, beneath which river are the under-ground dwellings 

 at Mkanna and Mkwamba. 



