TATE: SOURCE OF RIVER AIRE. 
at Airehead springs was first perceptible at 2.32 p.m., and 
by five o'clock it amounted to 13 inches for a breadth of 
4 feet. Meanwhile, a similar rise in the level of the water 
issuing from Malham Cove was being recorded. It was first 
indicated at 3.10 p.m. ; at 3.15 it had risen J inch; at 3.20, 
i inch ; at 3.35, 1 inch ; at 4.5, 2 inches ; at 4.45, 2 J inches; 
and by 5.30 the stream had risen 2| inches, its outlet being 
31 J feet wide. 
The weather throughout the day was much finer than on 
the first day. A snowstorm in the morning, hardly sufficient 
to wet the boulders, represented all the rainfall, too insignifi- 
cant to affect the springs. 
Third Day. — Stormy, with heavy rain during the morn- 
ing. The water was permitted to flow freely out of the Tarn 
during the day, and the high- water level was maintained 
both at Malham Cove and Airehead. At five o'clock the 
Tarn sluices were again closed as before. 
Fourth Day. — Clear and sunny. The streams at the Cove 
and Airehead gradually subsided, and by noon the water at 
the Cove stood £ of an inch below its normal level. At 5.45 
p.m. the water in the Tarn had not quite risen again to the 
level of the sill of the overflow, so that this sinking of the 
outflow at the Cove and Airehead confirms the experiment of 
the rise on the first and second days. Neither chaff nor bran 
has been seen since it was started on its voyage. 
These researches have proved conclusively that the 
streams issuing at the Cove and at Airehead are both sup- 
plied from Malham Tarn by way of the Tarn " TVatersinks." 
They also render it extremely probable that beneath Malham 
Cove there exists a water-cave, as suggested and figured hy 
Prof. Dawkins, having a wide and somewhat uneven floor. 
Some such physical conditions are required to account for 
the delay in the appearance of the flooded waters at the 
Cove, for although Airehead lies a mile and a quarter further 
