secretary's report. 
291 
ascertain more definitely if there existed any connection between 
Gaping Ghyll and the smaller springs in Clapdale, 10 cwt. of 
common salt was put into the waters of Gaping Ghyll on June 
4th, and a further 10 cwt. on June 5th, samples of the water 
from each of the springs being taken several times a day until 
June 25th. 
"One pound of fluorescein in alkaline solution was introduced 
into the stream flowing through Ingleborough Cave on June 8th, 
at 10 p.m., at the point where the water plunges down a hole 
in the floor of the cave, and marked ' Abyss ' on the 6-inch 
Ordnance map. 
" Five cwt. of ammonium sulphate w^as introduced into a 
sink on the allotment about 500 yards ^.'E. of Long Kin East 
on June 9th, at 3 p.m.; and at 3.15 p.m. on the same day 1 lb. 
of fluorescein in alkaline solution was poured into the stream 
which flows past the shooting-box on the allotment and sinks 
near the Bench Mark 1320-1. 
"The fluorescein introduced into the abyss came out of 
Clapham Beck Head, and possibly at Moses Well and other 
springs in Clapdale, but this point requires further investigation, 
the evidence being as yet somewhat unsatisfactory. 
"The salt from Gaping Ghyll appeared at Clapham Beck 
Head on June 15th, 16th, 17th, 18th, 19th, 20th, and 21st, 
being at its maximum on June 18th, but not at any of the 
other springs. 
"The ammonium sulphate put into the sink on the allotment' 
appeared at Austwick Beck Head on June 22nd, the other springs 
in the neighbourhood being unaffected on that day ; but on the 
24th and 25th there were slight increases in the amount of 
ammonia in two small springs in Clapdale, viz., the small spring 
below Clapdale Farm and Cat Hole Sike. As one of these 
streams is close to the farmyard, and the other was at the time 
nearly dry and flowing through pasture-land, no importance is 
attached to these slight increases. 
" Of the fluorescein put in below the shooting-box no trace 
has since been found, and the same is the case with ^ lb. of 
