170 
si:("i;i:tai;v's ijkpoht 
At P 34a the water falls into another open joint, running 
X. 25^ E.. which leads it to S 51. whence it runs over the surface 
to P 43, again beneath the surface to S 40, and then on to S 42 
and P 37, where it again disappears. 
At the time of these experiments the greater part of the 
water was sinking in the bed of the stream at P 37r/, but a 
little was flowing on to P 37 near the old limekiln. 
Fluorescein put into the stream just above P 37a came 
out at P 38, where it again sank and reappeared half an hour 
later almost simultaneously at S 43 and S 44. 
It was then traced to P 39. where it again went underground 
to issue at Font Green Spring, S 45. 
At P 40 part of this stream sinks (the whole of it in dry 
weather) to reappear at S 46, and part flows over the surface, 
the streams when reunited forming Selside Beck, which runs 
through the village of Selside and on into the river Ribble. 
The above streams occupy a wide valley and would, with 
the exception of Gill Garth Beck (P 26 to P 37). all drain into 
Selside Beck were they not swallowed into cracks in the lime- 
stone. 
There would appear to be two distinct sets of channels 
below Font Green — a deeper and a more superficial one. 
The water flowing by the deeper channel — viz.. that from 
Alum Pot. Long Churn, and P 41 — reaches the Ribble by way 
of Footnaw's Hole and Turn Dub. while the shallower set issues 
on Font Green and joins Selside Beck. 
Many of the underground stream courses are accessible, 
and may be followed for long distances with the aid of short 
ladders, and provided the explorer does not object to getting 
wet and doing a certain amount of crawling in the less lofty 
portions. 
It was laid down in the two previous re^^orts of this Com- 
mittee that as a general rule the flow of underground water 
in limestone rocks follows the direction of the master joints, 
and this view has been strikingly confirmed by several of the 
experiments which have been carried out during the current year. 
