THE UNDERGROUND WATERS OF NORTH-WEST YORKSHIRE. 
13 
continued for a sufficiently long period to show whether the flow 
from Malham Tarn had been drained by various fissures, joints, 
and faults towards Malhaia Beck as well as Aire Head. Also 
that the area through which the Malham Tarn water flows is 
capable of storing, probably in cracks and fissures, a large volume 
of water. The total area drained by Malham Beck and Aire 
, Head at the junction vvith Goredale Beck is approximately 6,000 
acres. 
In our opinion very little definite information can be 
gathered from experiments carried on during a few hours, there- 
fore should the Committee desire to continue them in order to 
ascertain the movement of underground water below the sink 
holes at Malham Tarn (which it will be noticed are closely 
connected with the North Craven Fault), we consider that it 
will be necessary to adopt a more elaborate plan and have 
gauges fixed not onty in the positions above mentioned but on 
Gordale Beck and other smaller streams in the district, and to 
continue the gaugings over a long period of time. It would be 
necessarv also to watch the streams along the line of the North 
and South Craven Faults to see whether the experiments affect 
them in any way. 
III. Report of the Chemical Sub-committee. 
BY F. W. BRANSON, F.I.C., AND W. ACKROYD, F.I.C. 
Sub-Committee meetings were held at Malham on the 26th 
and 27th of May ; on the evening of the 26th, at Lister's Arms. 
There were present : Messrs. Ackroyd, Bingley, Bray, Branson, 
and Swann. The prospecting work for the following day was 
arranged, and it was resolved, on going over the ground, to 
take samples of water for the determination of the chlorine 
figures to be used as data in future salt experiments, and to 
make a preliminary trial of an alcoholic solution of fluorescein 
as an agent for tracing the flow of underground waters. 
