292 
secretary's report. 
methylene blue introduced into Grey Wife Sike, above Newby 
Cote. 
" Several most interesting problems still await solution in 
this area, one of them being the relations of the Silurian floor 
which underlies the Carboniferous Limestone of the plateau to 
the flow of underground water. 
"The two sinks, Gaping Ghyll and Long Kin East, are 
only about 1,300 yards apart, and yet the waters of the one 
take a direction quite distinct from those of the other, and 
eventually emerge in a sejjarate valley, the distance between the 
springs being 1^^ miles apart, the great mass of Carboniferous 
Limestone known as Norber, a hill upwards of 1,300 feet in 
height, lying between the two valleys. 
" In Crummack Dale it is seen that the Silurian rocks form 
a ridge running in an approximately N.W. and S.E. direction, 
and uncomformably overlain by the Carboniferous Limestone. 
" If this line be continued it separates the Gaping Ghyll to 
Clapham Beck Head flow from that of Long Kin East to 
Austwick Beck Head. 
"Thus it appears that this ridge of Silurian rocks forms an 
underground water-parting, which the Committee hopes to be able 
to trace for a considerable distance across the area. 
"The magnitude of this undertaking will be to some extent 
realised when it is stated that upwards of 400 samples of water 
have been tested for common salt, annnonium, and fluorescein, 
making in all upwards of 1,200 tests. 
"The whole of the grant of .£40 has been spent upon the 
investigation, and a small sum in addition. 
"The experiments which have been carried out have indi- 
cated which are the most suitable reagents for use in different 
cases, and it is consequently hoped that future investigations will 
be carried out at rather less cost than has been the case up to 
the present. 
The Committee was reappointed, with a grant of ,£50. 
At the Meeting of the Committee at Clapham, on April 
27th, it was resolved that the following Sub-Committee should 
