rrr© Jsfcr. hennelLs Account of Arc 
anlwer to this, I fball obferve, that it is proved by experiment, 
that at any given time, the quantity of the increafe in different 
places, hears a juft proportion to the fum total of the increafe 
hi each place refpeftively : or, in Other words, that when the 
river has rifen three feet at Dacca, where the whole riling is 
• about 14 feet ; it will have rofe upwards of fix feet and a 
[half at Cuftcc, whereat riles 31 feet in all. 
The quantity of water difcharged by the Ganges, in one 
.fecond of time, during the dry feafon, is 80, oo'o cubic feet ; 
but in the place where the experiment was made, the river, 
when full, has thrice the volume of water in it ; and its mo- 
tion is alfo accelerated in the proportion of 5 to 3 : fo that the 
quantity difcharged in a fecond at that feafon is 405,000 cubic 
feet. If tve take the medium the whole year through, it will 
.be nearly 1 80,000 cubic feet in a fecond. 
THE Burrampooter, which has itsfource from the oppofte 
fide of the fame mountains that give rife to the Ganges, firft 
'takes its courfe eaftward (or directly oppofte to that of the 
Ganges) through the country of Thibet, where it is named 
Sanpoo or Zanciu, which bears the fame interpretation as the 
Gonga of Hindooftan^ namely, the River. The courfe of it 
through Thibet, as given by Father du halde, and formed 
into a map by Mr. d’anville, though fufficiently exafl for 
the purpofes of general geography, is not particular enough to 
afcertain the precife length of its courfe. After winding with 
a rapid current through Thibet, it walhes the border of the ter- 
ritory of Haifa (in which is the refidence of the grand Lama) 
and then deviating from an eaft to a fouth-eaft courle, it ap- 
proaches within 220 miles of Yunan, the wefternmoft province 
of 
