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secretary's report. 
"On the same day Ih lb. of fluorescein in alkaline solution 
was put into a pot-hole known as Long Kin East, about 1,300 
yards north-east of Gaping Ghyll. 
" In view of the important influence which the direction of 
the joints in the limestone had been found to exercise over the 
flow of underground water, the direction of the joints in the 
limestone clints in the neighbourhood of Long Kin East was 
taken, and was found to be X.X.W. to S.S.E., and to run in 
such a direction as to lead to the probability that the water 
would reappear at the springs at the head of Austwick Beck, 
and these were consequently watched. 
''The ammonium sulphate put in at Gaping Ghyll reappeared 
at the large spring at Clapham Beck Head on the morning of 
May 3rd, and continued tu flow until the evening of May 6th, 
when the water again became normal. Thus the time occupied 
by the ammonium sulphate in travelling from Gaping Ghyll to 
Clapham Beck Head, a distance of one mile, was about five days. 
" Xo ammonium sulphate was found in any of the other 
springs in Clapdale. 
" This result proved beyond doubt that Gaping Ghyll was 
connected with Clapham Beck Head. 
"The fluorescein put in at Long Kin East showed itself at 
Austwick Beck Head, but not at any of the neighbouring springs, 
on May 11th, having taken over thirteen da,j8 to travel, the 
delay being probably due to the small amount of water flowing 
at the time of the experiments. 
"These results are of considerable importance, as they 
definitely reveal two lines of divergent movement of these under- 
ground waters, and indicate a subterranean watershed of much 
interest. The influence of the master-joints of the Carboniferous 
Limestone in determining the direction of flow of these under- 
ground waters was also, as at Malham, clearly shown. 
"The next set of experiments was carried out by the joint 
Committee on June 8th and following days. 
" In order to confirm the results in connection with the 
Gaping Ghyll to Clapham Beck Head flow, and further to 
