THE UNDERGROUND WATERS OF NORTH-WEST YORKSHIRE. 19 
the end of October 168 samples of water were taken at 
various points in the search for these compounds, involving 
83 quantitative estimations of chlorine and 336 qualitative 
observations for the fluorescein and ammonium sulphate. No 
evidence of the fluorescein has been observed. The ammonia 
began to be excessive in amount at New Laithe Bridge on the 
7th of September. The chlorine figures of the samples from 
Mire's Barn, Gill Flats, had risen from the normal unit to ll'l 
on the 23rd of September, and on subsequent dates were as 
follows: — September 24th, 12*5; September 25th, 12-8; September 
26th, 7-6; September 27th, 2-9, and on the 28th the chlorine 
had fallen to normal (Plate lY.). It is noteworthy here that 
the rising chlorine was shortly preceded by heavy rain- 
fall, as was the previous experience in the Malham Cove 
observations. These results appear to be confirmatory of the 
Committee's hypothesis as to the course of the underground 
waters in this particular area of the Malham district. There 
were present at Malham on August 26th : — Messrs. Ackroyd, 
Bingley, Branson, Howarth, and Kendall. The analyses were 
subsequently made by Messrs. Ackroyd, Branson, and Burrell. 
List of Chemicals Used, and Results. 
13 cwt. ammonium 
Malham Tarn Beck, 
sulphate. 
below sluice, 10 a.m. 
3 tons of salt. ^ 
Smelt Mill Water 
3 lbs. of fluor- 1 
Sink. 
escein. J 
1 lb. of fluorescein. 
Tranlands Beck. 
7 cwt. ammonium 
Upper Gordale Beck, 
sulphate. 
by foot bridge. 
1^ lbs. fluorescein. 
Grey Gill Cave. 
18 cwt. salt. 
Cawden "Burst." 
Showed at Aire Head 
and Malham Cove, 
July 4th to 11th. 
I" Showed at Malham 
Cove, July 4th to 
[ nth. 
Showed at Scalegill 
Mill, June 23rd. 
{Showed at Springs 
below Gordale 
Scar, Sept. 7th. 
/ No results up to 
\ October 31st. 
f First noticed at 
I Mire's Barn, Gill 
1 Flats, Sept. 23rd 
I to Sept. 27th. 
