W8 Dr Christie on the Meteorology/, Geology, Sfc, 



tural colour. Some, on the other hand, are built of greenstone, 

 and are consequently black. , 



The Hindoos polish all kinds of stones by means of powdered 

 corundum, mixed with melted lac. The mixture being allow- 

 ed to cool, is shaped into oblong pieces, of three or four inches 

 in length. The stone is polished by being sprinkled with wa- 

 ter, and at the same time rubbed with these oblong masses ; and 

 the polish is increased by masses being used successively with 

 finer grains. 



Transition Rocks. 



These rocks occupy a very large part of the Darwar and 

 Canara districts, and of the territory of Goa. They extend 

 from the eastern and southern parts of the Darwar district, 

 where they succeed the granite, to the western foot of the Gauts, 

 being, in a few spots only, interrupted by the granite, which 

 protrudes from beneath them. On the coast, they are concealed 

 by the ferruginous claystone ; but, in a few places, are seen crop- 

 ping out from beneath it. In some parts of the Gauts they are 

 covered by the same claystone, and by trap rocks. In the 

 northern parts of the Darwar district, they are only seen in the 

 bottom of the valleys, which intersect the sandstone hills. In 

 the central and southern parts of the district they are only co- 

 vered by the black soil, called Cotton Ground, which there 

 forms extensive plains, and will be afterwards described. To 

 the west of Darwar the transition rocks form parallel ranges of 

 hills, having a general direction of south-east, which is the same 

 as that of the strata of which they are composed. 



The principal rocks of this series are clay-slate, chlorite- slate, 

 talc-slate, limestone, greywacke, gneiss, and quartz rock. The 

 strata appear to have a general direction of north-west and 

 south' east. They are generally highly inclined, and, in many 

 instances, quite vertical. 



Clay-Slate. — A great many varieties of this rock are met 

 with in these districts. Its principal colours are grey, blue, 

 greenish, red, and white. The grey variety appears to be the 

 most common. I have met with it near KuUadghee, a few 

 miles from Darwar, at Hoolgoor, along the river Mulperba, and 

 in Soonda. At KuUadghee it contains beds of white quartz, in 



