UNDERGROUND WATERS OF NORTH-WEST YORKSHIRE. 271 
fine weather, on the east ; while the portion to the south of the 
ridge discharges its waters by way of S 31, S 31a, S 31b, S 31c, 
IS 32, S 32a and S 33. (S 34 and S 34a are small streams rising 
in the peat bog known as Swarth ^loor.) 
The Sinks in the neighbourhood of Alum Pot. [Pis. XXII., 
XXVII., and XXIX.] 
Fell Close Sike rises on the steep slopes of Simon Fell and 
flows in an E.S.E. direction until it sinks at P 18 into a thin 
limestone of the Yoredale Series. Fluorescein introduced at 
P 18 reappeared a short distance below and again sank at P 19, 
this time into the Mountain Limestone. From this point on- 
wards the joints in the limestone carry the water in a northerly 
direction almost at right angles to the slope of the ground, 
across a series of " clints and to S 51 [PI. XLL, Fig. 2], where 
it again comes to light. At this point it is joined by a 
stronger flow of water from P 25 and P 26, which will next be 
described, together witli the further course of tlie water from 
S 51. 
P 25 receives a stream which is very puny even in wet 
weather and passes on to P 43a. 
P 26 receives a much more important stream, which on 
entering the limestone falls into the joint line and runs parallel 
to the water from P 19 — reappearing at P 43a. The line 
of joint is well marked, both by crevices in the clints and 
by a line of pot-holes, in some of which the water shows itself. 
It runs N. 18° W. 
At P 43a the water falls into another open joint, running 
N. 25° E., which leads it to S 51. 
From S 51 the water flows through a shallow open channel 
in the limestone, sinks at P 43, and again emerges partly 
from a small cave at S 40 and parth^ from a spring at S 40a, 
almost immediately sinks again and comes to the surface at 
two adjacent springs S 42. From S 42 the stream flows over a 
pasture, passes through a wall, crosses the corner of a second 
pasture, then under another wall into a third field. After 
passing through the second wall, the stream is partly absorbed 
