196 REPORT— 190B. 



further down at S 109. It again sinks at the foot of Haws Gill, P 87, 

 where it is joined by the water from Eller Keld Spring. 



Except in cases of exceptional flood, the bed of the stream below this 

 point is dry, and from the point where Philpin Lane crosses the channel, 

 to Philpin Hole, it is occupied by meadow land, which shows no sign of 

 having been recently overflowed. 



In the clough above Weathercote Cave the water can be heard below 

 the stream bed, and actually comes to the surface in several places in wet 

 weather. It emerges in the flne waterfall in Weathercote Cave, and again 

 passes below the limestone at the bottom of that pot. 



The water sinking in Weathercote Cave then passes through the pool 

 at the bottom of Hurtle Pot, and finds its way lieneath the surface to 

 Gods Bridge, where it finally comes to light, and flows off the carboniferous 

 limestone on to the Silurian rocks some 200 yards farther down stream. 



In extremely wet weather Weathercote Cave fills up and overflows at 

 the surface, washing over the carriage drive, and flows into Jingle Pot, 

 and also down the, at other times deserted, river bed. 



Hurtle Pot, when the stream is in moderate flood, makes an extremely 

 weird noise, similar to that produced by the inrush of water and air when 

 the plug is removed from the bottom of a lavatory basin, but immeasurably 

 louder. This noise is caused by the suction of air through gigantic eddies 

 produced in the deep pool at the bottom of the pot. 



In extremely heavy flood Hurtle Pot fills up and overflows into the 

 surface channel, thus acting in a manner precisely similar to Footnaw's 

 Hole, described in the last report of the committee. 



The surface channel from Chapel-le-Dale Church to Gods Bridge is 

 usually dry, but is occupied by the stream when in flood. 



The underground channel seems to follow the direction of the open 

 one very closely, as the water can be heard at many points, and appears 

 at the surface in wet weather. 



The following is the fluorescein record from which the above has been 

 deduced : — 



Two pounds of fluorescein put into the stream just below the mouth of 

 Gate Kirk Cave, on the morning of August 23 : Sank at P 85, and emei'ged 

 at S 108 at 1 p.m. ; sank at P 8G at 1.30 p.m. ; seen at S 109 and P 87 

 at 2 P.M. 



August 24. — Seen in Weathercote Cave at 9.15 a.m. ; seen in Hurtle 

 Pot at 10 A.M. 



August 25. — Arrived at S 112 (Gods Bridge) at 12 noon. 



It will be seen that the work on Ingleboro' is now almost completed. 

 It only remains to test two streams which have hitherto proved refractory, 

 and one or two small streams on the west side of the hill. These latter 

 should offer little difficulty, as the main flows on both sides of them have 

 been determined, and their possible range thus limited. 



We have been unable as yet to carry out the proposed borings at Turn 

 Dub, owing to the absence of the owner of the property in South Africa, 

 and our consequent inability to obtain the necessary permission. 



Through the courtesy of the Yorkshire Ramblers' Club several members 

 of the joint committee were enabled to make the descent of Gaping Gill, 

 the pothole mentioned in the first report of the Committee, and to explore 

 the extensive system of chambers and passages at the bottom of the shaft. 



The thanks of the Committee are dufe id the follo\ring gentlemen, who 



