1850.] in Southern and Central India. 271 



very striking, with the same form I have before noticed, fewer peaks, 

 and lying at right angles to each other in many instances. Once or 

 twice I observed a complete quadrangle all but one side, the opening 

 being towards the plain. 



Wednesday y 2nd March, 1819. — A rugged road from the frequent 

 ascent and descent of the trap hills. On one of them I observed a 

 vein of quartzose rock passing into flint running E. and W. I crossed 

 the Scinde ; the bed consisting entirely of black trap or basalt, very 

 compact. At Dapky I lowered the temperature of Fahrenheit from 

 92° to 62° at sunset. I noticed a bed of lithomarge on my road. 



Thursday ', 3rd March, 1819. — The hill on which the flag is fixed 

 about four miles and a half from Oudeghir, is covered with calcedony 

 amorphous, cellular with impressed crystals, and striped mammillary 

 onyx, some imbedded in the cavities of the basalt ; amongst them I found 

 one piece of green amorphous calcedony. Five hundred yards from the 

 tent, I saw on the side of a hill, exposed by a slip, imperfect columns of 

 basalt resembling precisely the description in Thomson's Annals ; the 

 Rowley Rag basalt. Oudeghir (the fort) stands on one of the flat hills 

 so frequently mentioned surrounded on every side by the semi-columnar 

 basalt. 



Friday, 4th March, 1819. — I rode through the town of Oudeghir, 

 which is entirely built of basalt. It is the largest native town I have 

 seen, some of the streets wide and the houses neat. My sketch of the 

 hills to the northward of the fort, when seated on a neighbouring hill 

 on a level with it, is the best I could take ; it ill represents the singular 

 rise one above the other of the basalt : the hills representing to the 

 eye an appearance of distinct strata, which reminds me of the Isle of 

 France ; beds of carbonate of lime are very frequent. I noticed on my 

 way semi-columnar basalt in a large deposit to the left of the town. 



Saturday, 5th March, 1819.— In the evening I rode to the right of 

 the town and came to something very much resembling the iron clay, 

 not very dissimilar to that of the Cape of G. Hope. 



Sunday, 6th March, 1819.— In the evening I rode to the basalt ; I 

 found one column, of 8 sides, more than a metre in diameter, the inters- 

 tices were filled with green earth and sometimes with the globular wacke. 

 In some of the columns I noticed depressions and elevations for the re- 

 ception of a corresponding piece as in the Giant's Causeway and Staffa. 



2 n 2 



