18 Obsetvatiofis on the Geology of the Hyderabad Country. 



the greater the pressure, the more perfect is the consolidation. 

 This is a power with whose effects we are well acquainted. 

 By bringing the particles of bodies closer to each other, pres- 

 sure becomes a powerful cause of consolidation ; and I am 

 convinced that without the assistance of any other agent, it is 

 one of the most general and powerful causes of the changes 

 which happen in the mineral kingdom. 

 Camp Kulle-dghee, 1st July, 1824. 



Rock Specimens from the Vicinity of Hyderabad. 



The specimens from No. 1. to 13. are the most common va- 

 rieties of granite in the Hyderabad country. 



1. 2. S. 4. are from Bowenpilly, several miles to the north 

 of the city of Hyderabad. 



5. and 6. are from Shumshabad, about twelve miles west of 

 the city ; 5. is from a stratum about half an inch thick, resting 

 on that from which 6. was taken. 



The specimens from 7. to 20. inclusive, are from Moula 

 Alley. 



Moula Alley hill is a large mass of lamellar granite, of a 

 mamillary form, having a smooth surface, perfectly devoid of 

 vegetation, except on a very few spots, where the disintegrated 

 granite has formed a superficial bed of soil. The lamellae of 

 the granite in some places scale off, split in various directions, 

 and gradually slide or fall down into the neighbouring valleys, 

 where they continue to break down into still smaller masses, 

 until they become completely disintegrated. The lamellae 

 vary from a few inches to many feet in thickness. 



9. and 10. occur in great abundance in the hill of Moula 

 Alley. 



12. Red granite with very little mica. The bed from which 

 this specimen was taken, rests upon No. 9. 



13. Granite with the mica in large concretions. 



14. White granite without mica. 



15. Granite containing a vein of mica. 



16. A variety of granite with mica predominating, from a 

 nodule in one of the common kinds of granite. 



17. From a nodule in the granite. 



18. From a nodule of trap in the granite. 



19. From a trap vein about twelve feet thick, with part of 

 the contiguous granite adhering to it. 



20. Trap passing gradually into granite. 



21. 22. 23. 24. from a vein of quartz in the granite, ex- 

 tending from near the city of Hyderabad, several miles in a 

 northerly direction. This vein is of a very considerable mag- 

 nitude. 



