230 Mammoth. Cave of Indiana. 
dreds that we have seen. Feet above water, and fathoms under, 
seem to he the general run of their specific gravity.” | 
‘* His Majesty’s ship Isabella, at sea, lat. 75. 25. 
long. 67. 7. variation 83. 48.—July 25. 
“ Dear D+—, This is our last opportunity this year, there- 
fore I could not let it pass without writing, although nothing 
has passed since my last. We are now to the northward of all 
‘the ships that are fishing; we see some a long way a-stern; the 
boat with dispatches is going immediately to one of them ; they 
have followed a great way this year, and have been very kind 
in giving us every assistance when in the ice. I sincerely wish 
them all safe back; they have a long way to go through the ice. 
The coast begins to look more and more miserable ; as we get 
north, it has more the appearance of a chain of ice mountains 
than land; the sea is one solid field of ice as far as the eye can 
reach. When the wind blows from the north, we find narrow 
passages in it, and through them we pass on: sometimes the 
‘whole of our men are on the ice, dragging the ship along the 
edge of the flaws. From the very great variation, we cannot be 
a great way from the magnetic pole; you will see the variation 
by our last observation on the ice at the head of the letter.” 
MAMMOTH CAVE OF INDIANA. 
‘The Kentucky Commentator contains a letter from a Mr. 
Adams, giving an account of a cave which he had explored in 
Indiana. The Editor of: the Commentator, in his introduction 
to the letter, says, this cave ‘‘ has never yet been fully explored, 
though several individuals, whose’ testimony is to be relied on, 
have penetrated from six to nine miles into this subterraneous 
region.” ' 
Mr. Adams states that the cave is situated in the north-west 
quarter of section 27, in Township No, 3 of the second eastern 
range in the district of lands offered for sale at Jeffersonville. 
It was first discovered about eleven years ago, at which time the 
bottom of the cave was covered with salts from six to nine inches 
deep; the sides were also coated in the same manner, and had 
the appearance of snow. : 
The hill in which the cave is situated is 400 feet high, the 
top principally covered with oak and chesnut. The entrance is 
about half way from the base to the summit, and the surface of 
the cave preserves about that elevation. 
The entrance is by an aperture of 12 or 15 feet wide, and 
three or four feet in height: with .an easy descent, you enter a 
room which continues a quarter of a mile, varying in height from 
8 to 30 feet, ard in breadth from 10 to 20; the roof arched in 
some places, resembling an inside view of the roof a house. At 
the 
