318 CUTTRISS : NOTES ON THE CAVES OF YORKSHIRE. 
to, this may be followed for several hundred feet until the roof once 
more sinks to the level of the water. The furthest point it is 
possible to reach is about coincident with one side of the triangular 
fault. The vertical descent from the entrance of Goyden Pot 
(which is at an elevation of 705 ft. above the sea) to the 
"furthest possible" is 104 ft., making an average fall of 15%. 
From that point to where the water issues, a distance of 1-J miles, 
the average fall is considerably under 1 %; there is little probabilit}^, 
therefore, of ever being able to force a passage right through. An 
examination of the passage of debouchure below Lofthouse, to do 
which means wading through water 4 ft. deep, reveals it blocked 
entirely by a fall of the roof some 60 ft. from the opening. 
Goyden Pot is an interesting cave to explore, and not difficult 
of access as far as the end of the large chamber, but it should not 
be entered in doubtful weather. Like all other mountain streams 
the Nidd is subject to sudden and heavy floods. As only a limited 
quantity of water can sink at Manchester Hole, the excess is 
swallowed up by Goyden Pot, making exit from the cavern 
dangerous or even impossible in a few minutes. At times of 
heavy rain the cavern fills completely, eloquent evidence of which 
is observed in the branches of trees firmly wedged in crevices in 
the roof. 
In the neighbourhood of Troller's Gill, about two miles north- 
east of Appletreewick, in Wharfedale, is a cave of a more sporting 
character, from the variety of difficulties it presents to the explorer, 
than any other I know of in the district. Being little known to 
the inhabitants of the district, I give it the name of Troller's Cave 
as indicating the locality in which it is to be found, although on the 
6-in. Ordnance Map it is designated " Hell Hole." The first com- 
plete exploration of this ca^ e was made in 1896, by five members of 
the Yorkshire Ramblers' Club, Messrs. T. Booth, G. T. Lowe, Lewis 
Moore, J. AV. Swithenbank, and the writer. At the head of the 
Skyreholme Dam two valleys unite — the one to the right, down 
which a stream of water runs between perpendicular cliffs, is Troller's 
Gill. Following the left-hand valley, which is dry, the entrance to 
a disused lead mine (Head Vein) is reached. On the top of the hill. 
