678 MR. G. F. SCOTT ELLIOT AND DR. J. W. GREGORY [Nov. 1 895, 



the Samia Hills, which are of interest, as they appear to he formed 

 of a synclinal set of sedimentary rocks, at the base of which occur 

 the ironstones around Berkeley Bay. The ore occurs in pockets 

 40 yards in diameter, which are scattered in a bed about 200 feet 

 thick; the strike is from N.N.E. to S.S.W., and the bed dips 

 80° east. 



The ore is a red haematite, and for several assays of this we are 

 indebted to Mr. W. Tate, P.C.S., of the Eoyal College of Science, 

 South Kensington. He reports as follows : — 



Analyses oe Iron Ore. 



No. 55. — Dark red, in bulk and in powder. The ore was com- 

 paratively soft. It contained, among other things, phosphorus in 

 appreciable amount, and silica in very considerable quantity, but 

 no sulphur or titanium. Percentage of iron =41-08. 



No. 56. — Dark red in bulk ; when ground to powder, dirty yellow. 

 The ore was very hard. It contained, among other things, sulphur 

 and phosphorus in appreciable amount ; of titanium only a trace. 

 Percentage of iron =61*69. 



No. 59. — Very refractory, only partially dissolved by nitric acid 

 and potassium chlorate. Substances present : alumina, silica, phos- 

 phate, traces of sulphate, carbonate, and titanium. 



A sample of the ore (not including the white portion) was made 

 and finely ground. Weighed portions were fused with potassium 

 bisulphate, dissolved in acid, and the iron estimated by perman- 

 ganate solution. Mean result = 43*21 °/ iron. 



The Karagive Series. — The occurrence of sedimentary rocks in 

 Karagwe was first reported by Speke from the evidence collected by 

 himself and Grant. The rocks here are more extensive than those 

 of the eastern side of the Nyanza, and may be part of the series 

 that occupies an enormous tract of country in the upper basin of 

 the Congo. 



The rocks of this series occur throughout almost the whole of 

 Karagwe, Ankole, and Koki. They may be divided into four main 

 groups, which occur in the following sequence : — 



1. Granular quartzite. 



2. A coarse schistose sandstone. 



3. A series of red and brown sandstones containing beds of 

 haematite. 



4. A series of argillaceous beds which range from shales to a 

 well-cleaved killas. 



The rocks are inclined at a high dip, and have been so much con- 

 torted that it is difficult to form an idea of their thickness. But 

 as they extend from Butunguru on the Kagera river to Kiarutanga, 

 a distance of about 100 miles, and numerous valleys from 1000 to 

 1200 feet in depth have been cut through them without reaching 

 the gneiss, there can be no doubt that they are of great thickness. 



