482 Xotes, chiefly Geological, from Goofy to Hydrabad. [May, 



of E. S. E., which has apparently determined that of the Kistnah across 

 the peninsula after escaping from the overlying trap formation. One of 

 the peaks rises from the rest like truncated cone. 



As I was obliged to pass the granite and lime-stone junction line hy 

 night, I am unable to afford a description of the disturbance, or of the 

 mineral alteration in the latter rock which might be anticipated. 



A succession of these rocks continues to be crossed until Judcherla 

 is approached, 50 miles north from the Kistnah, when they sink into 

 smooth undulating plains with an occasional granite rock starting up. 

 The rocks in the centFe of this granitic zone, in the vicinity of Paungal, 

 attain the highest elevation, (viz. about 1000 feet above the plain.) 

 The highest which I had an opportunity of measuring trigonometri- 

 eally, did not exceed 950 feet. 



The granite is generally small-grained, with reddish felspar, often 

 coloured (as near Paungal) with actinolite or chlorite in quartz and 

 felspar veins. Here also a graphic granite occurs in the gneiss. 



Granitoidal gneiss (for the transition from granite to gneiss is imper- 

 ceptible, and the alteration by contact under great heat mutual) is seen 

 in low and rather smoothly swelling hills, around the bases of the 

 loftier granite peaks. 



The basaltic green-stone dykes have usually an easterly direction : — 

 and, as a general rule, large dykes are crystalline towards the centre* 

 and compact at the edges like the lava dykes of Somma and Etna. I 

 observed crystallized epidote on a dyke at Paungal. Another dyke is 

 seen close to the west side of the town of Judcherla, about 40 paces 

 broad, and may be traced westerly as far as the eye can reach. 



From Judcherla to Hydrabad, 59|- miles northerly. — From Jud- 

 cherla the country is open; the formation gneiss, — penetrated by 

 granite and basaltic green-stone. At Nagumpilly the fort stands on 

 a bed of quartz in the granite which is intersected by a basal- 

 tic dyke containing hypersthene. A second dyke is seen between 

 Nagumpilly and X^urrucknugger ; and two others a little north of Fur- 

 rucknugger. This latter is from 30 to 50 paces broad, and takes a 

 zigzag; direction towards the east. Abundant efflorescences of natron 

 take place on the surface of the soil in the vicinity. 



Beds of quartz become more frequent in the granite as Hydrabad is 

 Reared. At Nagumpilly, just mentioned, 17 miles south of Hydrabad > 



