UNDERGROrXD WATERS OF NORTH-WEST YORKSHIRE. 277 
then continued by a series of sloping passages and chambers to 
a depth of 290 feet, at which level the water stands up to 
the roof, barring further progress* (Fig. 5). 
The joints in the neighbourhood of Alum Pot are more 
complicated than in the parts of the district previously in- 
vestigated, there being three sets of joints, all more or less 
irregular in places. 
Close to Alum Pot there are two sets running S. 5^ W. 
and N. 80^ E. respectively. 
Thirty yards higher up Alum Pot Beck they run due X. 
and S. and X. 80° E.. the north and south joints being the stronger 
and more continuous. 
On the " clints." 100 yards above the Pot. there are three 
sets of joints, as follows, viz. : — 
At 4 p.m. on September 5th. 1901. tliree (quarters of a pound 
of fluorescein was put into tlie water flowing down Long Churn 
(which has already been shown to communicate Avith Alum 
Pot) and a similar quantity at 5.30 p.m. on the same day. 
On September ITtli. the water of a large spring, Turn Dub 
(S 67) (Pis. XXII. and XXVII., and XXXV., Fig. 2). on the 
opposite side of the River Ribble, was strongly coloured, the 
fluorescein having been observed on the previous day in the 
pool at the bottom of Footnaw's Hole (S 65) [PI. XXXV., 
Fig. 1]. Twelve days were thus required to accomplish the 
journe}^ of 1| miles from Alum Pot to Turn Dub. 
The relative positions of Long Churn. Alum Pot, Footnaw's 
Hole, and Turn Dub vnil be seen b}' reference to PI. XXVII. 
The top of Alum Pot is 1,125 feet above the sea. and at 
the furthest point reached, viz., at a depth of about 290 feet 
from the surface, or at 835 feet above the sea, the water com- 
pletely fills the passage, which gradually slopes below its surface. 
Xow the lip of Footnaw's Hole is just below the 825-foot contour, 
^ *A full description of Alum Pot will be found in the Yorksliire 
Ramblers' Club Journal, vol. ii., Xo. 5, pp. 3o-47. 
Secondarj^ 
Master 
. . X. 10° E. 
(X. 35" E. 
• • IX. 85" E. 
