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VON TROIL’S LETTERS ON ICELAND. Fol
pillars crowded clofe together. The bottom of the cave, which is filled with clear
frefh water feveral feet in depth, is likewife covered with innumerable pieces of pillars,
which compofe its floor. The colour of the pillars is of a blackifh grey; but between
the joints there is a yellow ftaiaGtic quarry rind exhaled, which ferves to make thefe
divifions more diftinct, and produces an agreeable effect to the eye, by the many diffe-
rent modulations of colour. It is fo light within the cave, that one can diftinguifh the
innermoft range of pillars perfectly well frém without. The air in it is very pure and
good, as it is conftantly changed by the rifing and falling of the water during the tide.
Very far into the cave there is a hole in the rock, fomewhat lower than the furface of
the water ftanding in it, which makes a pleafing kind of noife on every flux and re-
flux of the tides. One may walk in moft parts of the cave on the broken points of
fome pillars arifing above the furface of the water, but it is moft convenient to go ina
boat. We made the following meafurements of the cave :
ele ai meee e
The length, from the fartheft of the bafalt pillars, which from the } . 6
fhore formed a canal to the cave - - av 6 P37!
From the commencement of the vault to the end of the cave 250 .0J
The breadth of its entrance . - S 53° 7
Of the interior end - - - 20 0
The height of the vault at the entrance of the cave - Tr7"26
Of ditto, at the interior end - . 70 0
The height of the outermoft pillar in one corner - 39° 6
The height of another, in the north-weft corner 3 54.0
The depth of the water at entrance - 18 0
Of the infide end - 4 °
; 4
Above the cave was a ftratum of a ftone mixed with pieces of bafalt. We made
the following meafurements :
pei
From the water to the foot of the pillars - = 36 8
Height of the pillars = = 4 32 6
Height of the arch or vault above the top of the pillars ns Ly sat
The {tratum above this - 2 ! 34
From hence, a little farther north-weft, we met with the largeft pillars which ‘are to
be found in the whole ifland. The place on which they {tood was likewife quite free,
fo that we were enabled to examine it. The following was the refult of our mea-
furement :
The weftern corner of Fingal’s Cave : woey Os
1. From the water to the foot of the pillars = 12 10
2. Height of the pillars = i s 37 3
3. The ftratum above them - J 3 66 9
Farther weftward :
1. The ftratum beneath the pillars - e fr 5
2. Height of the pillars : 3 54-0
3. The ftratum above - : Si: %&
Still more weftward :
1. Stratum beneath the pillars : L ‘ 17 4
2. Height of the pillars 3 = fo ©
3. The ftratum above them - é SII
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