1846.] from Devamunni and Nundi Cunnama passes. 387 



dark chloritic felspar porphyry, which is seen in a section afforded by 

 a well about 40 feet deep, at the south extremity of the ridge. It is 

 overlaid by a stratum of kunker ten feet thick, which has evidently been 

 deposited by water, charged with lime, rising through fissures in the 

 subjacent rocks, which are often encrusted with kunker. 



The Hendri river is forded about a mile to the west of Codamoor. It 

 is 220 paces broad ; banks and bed of silt and sand, imbedding tuface- 

 ous concretions of carbonate of lime, which encrust the roots of grasses, 

 &c. The shallow water in the channel of the river had a temperature 

 of 71° 5' Fah., which is a little lower than the average temperature of 

 rain water in this part of the ceded districts. The temperature of the 

 air in shade at the time of observation was 81°. The great evaporation 

 going on from the wide, flat, sandy bed, may have diminished the 

 temperature of the shallow stream which slowly trickled along its 

 centre. At Codamoor, the temperature of a brackish well, sixteen feet 

 deep, was 81°; that of a sweet water well, of similar depth, 84°; and 

 that of a third slightly brackish, and thirty feet deep, 83°. 



Kurnool. — From Codamoor to Kurnool, at the junction of the Tum- 

 buddra and the Hendri, extends a plain covered with little interrup- 

 tion, by regur. In this plain the diamond limestone and sandstone 

 formation meet with and overlie the hypogene schists ; over which we 

 have so long been travelling. The sandstone is seen in the low hills, 

 about one and a half miles south of Perla, which lies ten and a half 

 miles westerly from Kurnool ; near this are numerous dykes of basaltic 

 greenstone and deposits of kunker. 



A little to the NE. of Peddapa, five and a half miles westerly from 

 Kurnool, the limestone was first observed in sitii as a slightly elevated 

 bed, crossing the Kurnool road, running in a southerly direction, and dip- 

 ping towards the east at an angle of 35° ; while the hornblende schists, 

 on which it rested unconformably, were nearly vertical. 



The limestone is of a reddish-brown colour externally, but internally 

 of a purplish-red ; structure, schistose. It effervesces feebly with acids, 

 and fuses into a light greyish- green enamel, leaving a white calx of 

 caustic lime. It passes into cream-coloured, dull yellow, and green 

 varieties, which were analysed for me by my friend Dr. Macleod, In- 

 spector General of Hospitals, and found to contain so much magnesia 



3f 



