340 TiMEHRI. 



in miny parts closely resembling flint in appearance : the 

 second consists of greenstone ; while the third and fourth 

 are composed oifelstone and quartz-porphyry. The fel- 

 stone is remarkable for its fineness, and its close and 

 parallel jointing, along the lines of which the chief 

 weathering takes place — the surface being often covered 

 with a rusty coating. 



Here and there, the rock is hollowed out into 

 deep and wide basins, the sides of which are some- 

 times smooth, though usually rough and sharp-edged 

 according to the lines of jointing. Along these channels 

 on the South side of the first dyke and in the centre, 

 the main mass of the river discharges itself, but 

 several little tra6ls are to be found along the course of 

 the dyke, the whole or the greater part of which must 

 be covered with water during the heavy wet season. 

 Even during our short stay of a few days, the river fell 

 about two feet, leaving numerous isolated rock pools. 

 Along the various channels and over the greater part of 

 the moist rocks, the water-weeds (Lacis, etc.) are very 

 abundant, and the dry rock is covered with a thick felt 

 o^ their remains. 



Above the set of catara6ls, the river flows towards 

 the North, but it gradually curves round towards 

 the West, and at the foot of the second dyke, flows in 

 a more south-westerly dire6lion to the first dyke ; though 

 owing to numerous nearly submerged bars, the chief rush 

 of water over the steep bed takes on repeatedly S-like 

 curves in all dire6lions. Along the eastern face of the 

 first dyke, which crosses from North to South, the river 

 *ushes to the South end, forcing its way through and 

 over the barrier, rushing, splashing, and roaring in huge 



