816 Memoir of Sylhet, Kachar, ^ adjacent Districts. [No. 104. 



section of the rocks in their exact order from Thibet, across Assam, 

 Sylhet, and Tippera, are still to be collected. • 



The points of interest remaining for examination within this division 

 are : — 



1 St. The course of the Kupeli river from its source to its confluence 

 with the Di-yung, in the valley between Upper Kachar and Jynte. It 

 is likely to pass through a country the geology of which must deserve 

 attention, as the structure of the opposite sides of the valley must be 

 essentially different, the one upholding a table land, the other running 

 up into peaks and ridges, while the possibility that the river may offer 

 a navigable communication with some point easy of access from the 

 side of Sylhet, is an additional reason for examining it. 



2nd. The course of the Patli river near Laour. This river divides 

 the Kasia hills from the Garrows, and its valley must exhibit similar 

 diversity in the structure of its opposite sides with that of the Kupeli. 



3rd. I have already pointed out the interest that attaches to the 

 country in the middle parts of Tippera, and I may here add, that the 

 geology of this quarter must be valuable, as it is likely to be connected 

 with the system of mountains which separates Arracan from Pegu, and 

 to contain the extinct craters from which the volcanic remains above 

 noticed have issued. 



To conclude this account of the very diversified aspect of the country, 

 the vast semi-basin enclosed on the northern, eastern, and much of 

 the southern side by the mountains above described, may be conveni- 

 ently divided into two tracts, distinguished from each other by differ- 

 ence of level, and by dissimilarity of vegetable and agricultural produce, 

 as well as by their capacity for commodious habitations and occupa- 

 tions. A line drawn SE. from Chattak passing west of Taj pur, 

 through Nubigunj, and thence under the hills southward to Turruf, will 

 serve very nearly to separate these tracts. 



That to the westward, extending nearly to the Brahmaputra, is in 

 most parts always marshy, and the whole is subject to periodical 

 inundations of long duration, being in general under water from April 

 to the middle of November. The towns and villages, which in some 

 parts, more especially to the southward, are numerous, are built on 

 mounds raised with earth dug during the dry season ; the houses are 

 in clusters, huts for men, temples, mosques, and sheds for cattle, being 



