io8 Mr. rennell’s Account of fhe 
periodical flood rifes in different places. The circumffance I 
allude to, is, the difference of the quantity of the increafe (as 
expreffed in the foregoing table) in places more or lefs remote 
from the fea. It is a fa<ff, confirmed by repeated experiments, 
that from about the place where the tide commences, to the fea, 
the height of the periodical increafe diminiflies gradually, until 
it totally difappears at the point of confluence. Indeed, this is 
perfectly conformable to the known laws of fluids : the Ocean 
prefer ves the fame level at all feafons (under fimilar circum- 
ffance s of tide) and neceflarily influences the level of all the 
waters that communicate with it, unlefs precipitated in the form 
of a cataract. Could we fuppofe, for a moment, that the in- 
creafed column of water, of 31 feet perpendicular, was conti- 
nued all the way to the fea, by fome preternatural agency : 
whenever that agency was removed, the head of the column 
would diffufe itfelf over the Ocean, and the remaining parts 
would follow, from as far back as the influence of the Ocean 
extended ; forming a dope, whofe perpendicular height would 
be 31 feet. This is the precife ffate in which we find it. At 
the point of jun&ion with the fea, the height is the fame in 
both feafons at equal times of the tide. At Luckipour there- 
is a difference of about fix feet between the heights in the dif- 
ferent feafons; at Dacca, and places adjacent, 14; and near 
Cuftee, 3 1 feet. Here then is a regular Hope ; for the diffances 
between the places bear a proportion to the refpective heights. 
This Hope muff add to the rapidity of the ftream ; for, fup- 
pofmg the aefcent to have been originally four inches per mile, 
this will increafe it to about five and an half. Cuftee is about 
240 miles from the fea, by the courfe of the river ; and the 
furface of the river there, during the dry ieafon, is about 80 
feet 
