266 rXDEPvGROUND WATERS OF ^'ORTH-WEST YORKSHIRE. 
As one of these streams receives the drainage from a farm- 
vard. and the other was at tlie time nearly dry and flowintj; 
through pasture-land, the irregularity in the quantity of ammonia 
is not to be wondered at. 
With regard to the actual route taken by the water, nothing 
yery definite is kiiown, but it seems probable that it follows the 
direction of the underground passages leading from the Cavern 
of Gaping Ghyll, which have been explored and surveyed by 
members of the Yorkshire Ramblers' Club* [Fig. 4 and PL 
XXIV.], and passes through the inner portion of Ingleborough 
Cave by way of certain passages lying between the Giant's Hall 
and the deep gorge of Trow GiU (PI. XXXI.). 
Full accounts of Ingleborough, or Clapham Cave, as it is 
more frequently called, will be found in tlie Ramblers' Club 
Journal, t 
At 10 p.m. on June 8th, 1 lb. of fluorescein was intro- 
duced into the stream flowing through Ingleborough Cave, at 
the point where the water plunges down a hole in the floor of 
the cave, and marked " x\byss " on the 6 inch Ordnance Map. 
This appeared at Clapham Beck Head (S 12) ; and it was 
thought also at Moses Well (S 7), but subsequent investigations 
have shown that the waters of this spring have a dift'erent 
origin. 
P 4 is a dry pot-hole, blocked by fallen debris. 
Eastward of Gaping Ghyll. in the angle between the two 
walls at the head of Clapdale, is a deep depression (P 5) with 
signs of a stream course at the bottom. This is usually dry 
and has consequently not been tested. 
Sinks on The Allotment. 
P 6 Marble Pot has practically no stream and the same is 
the case with Jockey Hole and an opening immediately to the 
south of it, which has been recently explored to a depth of 
320 feet by several members of the Ramblers" Club, and will 
* Yorkshire Ramblers' Club Journal, Vol. I., pp. Go-123. 
I Yorkshire Ramblers" Club Journal, Vol. I., pp. •220-22S. 
Vol. IT., pp. 52-63. 
