from Silhet to Rampore, and from Calcutta to Silhet. The foot of the
Sikkim Himalaya has, I believe, been connected with Calcutta by the
great trigonometrical survey, but I am given to understand that the
results are not published.

My own barometric levellings would make the bed of the Mahanuddy and
Ganges at the western extremity of the delta, considerably higher
than I should have expected, considering how gentle the current is,
and that the season was that of low water. If my observations are
correct, they probably indicate a diminished pressure, which is not
easily accounted for, the lower portion of the atmospheric column at
Rampore being considerably drier and therefore heavier than at
Calcutta. At the eastern extremity again, towards Silhet, the
atmosphere is much damper than at Calcutta, and the barometer should
therefore have stood lower, indicating a higher level of the waters
than is the case.

To the geologist the Jheels and Sunderbunds are a most instructive
region, as whatever may be the mean elevation of their waters, a
permanent depression of ten to fifteen feet would submerge an immense
tract, which the Ganges, Burrampooter, and Soormah would soon cover
with beds of silt and sand. There would be extremely few shells in
the beds thus formed, the southern and northern divisions of which
would present two very different floras and faunas, and would in all
probability be referred by future geologists to widely different
epochs. To the north, beds of peat would be formed by grasses, and in
other parts, temperate and tropical forms of plants and animals would
be preserved in such equally balanced proportions as to confound the
palaeontologist; with the bones of the long-snouted alligator,
Gangetic porpoise, Indian cow, buffalo, rhinoceros, elephant, tiger,