secretary's report. 
289 
B. A. Burrell, F.I.C, S. W. Cuttriss (Leeds), R. Law, F.G.S. 
(Hipperholme), J. J. Wilkinson (Skipton), J. E. Wilson and F. 
Swann, B.Sc. (Ilkley), J. W. Handby (Austwick), Dr. W. 
Marshall Watts (Giggleswick), and Rev. G. H. Brown (Settle). 
The Committee met at Clapham on April 27th and 28th, 
and again on June 8th. The following report was presented to 
the Geological Section of the British Association at Bradford, 
by Mr. A. R. Dwerryhouse, F.G.S. : — 
"The Committee is carrying out the investigation in con- 
junction with a Committee of the Yorkshire Geological and 
Polytechnic Society. 
"The present is merely an interim report, as the work is 
still in progress. 
"It was decided that the work should consist of an investi- 
gation of the underground flow of water in Ingleborough. This 
hill forms with its neighbour, Simon's Fell, a detached massif, 
which is peculiarly suitable for investigations of this nature. 
"The summit of the group is formed of Millstone Grit, then 
follow Yoredale shales and sandstones, the whole resting on a 
plateau of Carboniferous Limestone. 
"Many streams rise on the upper slopes of ihe hills and 
flow over the Yoredales, but without exception their waters are 
swallowed directly they pass on to the Carboniferous Limestone, 
to reappear as springs in the valleys which trench the plateau. 
" The Committee first turned its attention to tracing the 
water which flows into Gaping Ghyll hole. 
" It was generally believed that the water issued at a large 
spring immediately above the bridge at Clapham Beck Head and 
immediately IjcIow the entrance to Ingleborough Cavern. 
"On April 28th specimens of the water from this spring 
were taken for analysis before the introduction of any test. 
"Two cwt. of ammonium sulphate was then put into the 
water flowing into Gaping Ghyll, and at the same time the 
amount of the water was gauged and found to be equivalent to 
251,856 gallons per diem. A few^ hours later a second quantity 
of two cwt, of the same substance was introduced. 
