266 
HUGHES : INGLEBOROUGH. 
On the higher slopes and is thrown off by the impervious shales, 
first reaches the jointed Mountain Limestone. They are some- 
times a little in advance of the actual lowest beds, but in such 
cases the shale has been cut back so far since the pot holes were 
first formed, or masses of impervious drift have thrown the 
water forward a little way from the bottom of the slope. Gaping 
Gill referred to above is one of the most striking of these, and 
is of special interest owing to the explorations which have 
been carried on in it, and the certainty that it is the source 
of the water which issues in Ingleborough Cave. 
About two miles further north and a little over half a mile 
west of Selside is the still more striking chasm known as Alum 
Pot. It is a good way from the top of the Mountain Limestone, 
but this is easily explained by the great masses of clay drift 
which cover that part of the mountain. For this reason also 
the swallow holes, which are numerous between this and Gauber 
at the north end of the Fell, enter the limestone at many different 
levels. Alum Pot receives the waters which collect on South 
House Moor and Borrins Moor in the bay between Simon Fell 
and Park Fell, and, like Gaping Gill, has received much attention 
from spelaeologists. 
On the east side of Ingleborough also, similar phenomena 
may be observed, but often with considerable variation, owing 
to difference of local conditions. For instance, Weathercote 
Cave is very near the base of the limestone and in consequence 
there is not the same great vertical extent of cavernous and 
fissured rock to contain the water in flood. Binder Scale Beck 
(which ordinarily enters the limestone at Long Slack, comes 
out again at Philpin Hole, and then plunges into Weathercote 
Cave) in heavy flood runs over the surface all the way and fills 
Weathercote to the brim. It usually issues a little below 
Weathercote House, and when the flat-roofed cavern known as 
Jingle Pot is not quite full, if the water is troubled, so as to lap 
against the roof of the cave, that and the compressed air make 
a curious gulping sound, from which the name of the place is 
derived. When ripples sufficiently high to touch the roof are 
not produced by the falling water within, waves may be pro- 
duced by throwing large stones in, but of course when the chamber 
