466 APPENDIX. 



the Himalaya ranges,* (which generally deviate between the 28° and 29° parallels of 

 latitude,) on the north to the line, (which can be traced without the hazard of much error) 

 separating on the south the sources of the rivers contributing to the Brahmaputra within 

 these limits, from those flowing in the opposite direction, is an extent of about 15-3 

 square degrees. 



The Irawadi, according to my map, drains up to the City of Amerapura, 13*9 square 

 degrees, excluding, of course, in this estimation, the whole tract whence the Kaynduayn 

 draws its supplies. 



Then, were the Sanpo supposed to contribute to neither of these rivers, it would be 

 fair to compare the Brahmaputra at Goalpara, with the Iraivadi at Amerapura : — but 

 who will venture to do this? Add, in imagination, the Sanpo to the Iraivadi, and then 

 by how large a quantityf ought the Irawadi at Amerapura, to exceed the Brahmaputra 

 at Goalpara — but who of those who have seen the two rivers, shall we find willing to 

 grant the possibility of such excess, or who will not indeed assert the reverse as the 

 fact. 



We can easily estimate the quantity of water drawn by the Brahmaputra from the 

 tract within the limits mentioned, since we know the entire discharge at Goalpara, and 

 also the discharge of the Dihong, the Dibong, and the Brahmaputra, separately in the 

 neighbourhood of Sadiija. 



In January 1828, the quantity of water discharged by the Brahmaputra 

 at Goalpara, including the Bonash, was, per second, Cubic feet, 1,46,188.J 



* Thibet and the Sanpo altogether excluded. 



t The quantity to be added is not so great as might without consideration be anticipated. It must be recol- 

 lected how small a quantity of rain falls in the elevated region of Thibet. We are informed that in parts of that 

 country, neither rain nor snow are known to fall, and that some mountains, of the great elevation of thirteen 

 thousand feet (seventeen thousand ?) are never covered with snow. 



t An account has been given of the manner of taking this .Section, and of computing the discharge. 



