THE UNDERGROUND WATERS OF NORTH-WEST YORKSHIRE. I ') 
F. Swann, B.Sc, and G. White. Messrs. Carter and Kendall were 
also present during tlie investigations of the following day. 
The general plan of work resolved on was as follows : — 
(1.) To sample Malham water the same evening so that the 
chlorine figures obtained could be compared with those of May 
.27th, and on the morrow : 
(2.) To continue the gaugings of water already commenced 
by Messrs. Fennell, Bean, Cuttriss, and Stewart. 
(3.) To put salt into the Smelt Mill Water Sink at 5 a.m. 
(4.) To put ammonium sulphate into the stream below the 
Tarn outlet at about 10 a.m. 
(5.) To examine the outlets at the Cove and Aire Head 
for the chemicals introduced in the morning, and 
(6.) To carry on the necessary quantitative and qualitative 
analyses required at the temporary laboratory in the Buck Hotel. 
These various duties were undertaken and carried out by the 
members as follows : — Mr. Bray superintended the putting in of 
the salt at the Smelt Mill Water Sink, Mr. Kerr saw the stream 
below the Tarn outlet charged with ammonium sulpliate. At 
10. a.m. the sluice at the Tarn was partially drawn so as to 
allow of a flow of water at the rate of 69,500 gallons per 
24 hours. This rate of flow was maintained until 1 p.m., when 
a much larger volume (not gauged) was sent down ; the sluice 
was closed about 2 p.m. 
Messrs. Bingley and Hawell took their posts by the Cove 
throughout the day, dividing their attention between testing for 
excess of chlorine, presence of ammonium sulphate, and register- 
ing the height of the water at the gauge : similar duties were 
performed by Messrs. Branson and Cuttriss at Aire Head, and 
from both these places samples were despatched by messengers 
every half hour to the Buck Hotel, where they were tested 
quantitatively by Messrs. Ackroyd, Burrell, and Swann. 
The chlorine figure of the sample taken the previous evening 
in Malham \dllage was found to be I'l, only a small variation 
from the results obtained on May 27th. 
