274 UNDERGROUND WATERS OF NORTH-WEST YORKSHIRE. 
the light-hand passage, while that to the left comes out to day- 
light at P 30. 
This passage is an underground ox-bow, a portion of the 
roof of which (at P 30) has fallen in. 
At P 30 a small stream from S 55 flows in. the origin of 
which will shortly be described. 
On entering the cave on the lower side of P 30 and turning 
sharpty to the right [PI. XXXIII., Fig. 2], we again encounter 
the water from the upper part of the passage, which has taken 
a shorter route and joins the passage which we have traversed 
by a waterfall some 12 feet in height. Below the fall the 
passage is nearly straight for some distance and then again 
turns sharply to the right, where the water enters a pool much 
encumbered with boulders. Here the water passes out of the 
cave by a low tunnel, through which daylight can be seen, 
and comes to the surface at Dickon Pot P 27, where it passes 
into a second cave. In order to explore this it was necessary 
to erect a wooden dam at the j^oint marked X on PI. XXVIII., 
which had the effect of turning the bulk of the water down 
an old high level course, which will shortly be described. 
From P 27 the water flows over a series of cascades, with 
a deep pool at the foot of each, and finally plunges down an 
underground shaft or pot hole which has not yet been fully 
explored. 
Fluorescein was introduced here during a descent of Alum 
Pot by members of the Ramblers' Club, and it was found that 
the water entered the cave at the bottom of Alum Pot, some 
250 feet below, by waj^ of a waterfall through the roof. 
The passage which took the water when the sluice in the 
dam X was closed, passes over a series of steep pitches, with a 
deep pool at the foot of each, and eventually opens into the side 
of Alum Pot at a depth of 80 feet from the surface. 
Thus it will be seen that the waters of Long Churn pass 
into Alum Pot, whether they go by way of Dickon Pot or the 
older and higher level channel below the dam. 
The two channels are connected, at a point about 100 feet 
beyond the entrance to Dickon Pot, by an extremely low passage, 
known to those who frequent the place as " The Creep," and as 
