1850.] in Southern and Central India. 203 



Thursday j 1 4th January, 1819. — We passed through Jogypett, 

 and crossed a plain about 7 miles in breadth, between the quartz rock 

 and the hill on which Col. Hampton's flag was fixed ; the sides were 

 covered with angular and rounded masses of a rapidly decomposing 

 greenstone or hornblende rock, on breaking which the grey colour of 

 the decomposing surface was found extending into the black crystal- 

 line rock for about 2 lines. The soil formed by its decomposition was 

 very rich and retentive of moisture. The form of the surrounding 

 elevations was nearly similar and had nearly the same N. and S. direc- 

 tion. The stone had no perceptible effect on the magnet. 



Monday, \8th January? 181 9. — We quitted Tadmanoo for Jogypett : 

 I had a better opportunity of observing the scattered lumps and 

 masses of granite, which are strewed without order on the plain at 

 the foot of the quartz rock. I observed no difference in its structure 

 from that of Hydrabad. On descending the hill I passed just before 

 the sun rose, through a stratum of air in which the evaporation was 

 rapidly going on, producing a very cold sensation ; when I came 

 to the bottom, as I had gone faster than to allow the inferior stratum 

 to be affected by the same cause, the warmth was very agreeable, 

 but as I could go no lower it speedily became cold as before, until 

 the sun rose and counteracted the effect of the evaporation. I forgot 

 to observe that the quartz rock is crystallized in rhombs, some of the 

 angles of which are very perfect. 



Tuesday, (Mungul) 19th January, 1819. — We crossed the quartz rock 

 wbich is not above three hundred yards in breadth and on descending 

 into the plain watered by the large tank of Jogypett, soon met with lumps 

 and masses of granite, which gradually increased to the river Manjira, of 

 which it formed the banks : on crossing the river, now about its medium 

 height, we observed with surprise veins of white granite passing through 

 thesyenitic granite, which forms its banks. The rock containing these 

 veins is much more susceptible of decomposition from the hornblende 

 which it contains, than the veins of red and white granite, and the 

 appearance produced, was like a fret work, when the broad surface of 

 the rock was exposed ; when an edge was left to the action of the 

 atmosphere it was in small diagonal ridges. 



This formation appeared confined to a space of a few hundred yards 

 only on the right bank of the river. 



