38 THE UXDERGROUXD WATERS OF XORTH-WEST YORKSHIRE. 
J. — Delay in Transit. 
The investigations show that the flow of underground water 
is much slower than was generally supposed. 
K. — Underground Caverns and Pools. 
The investigations have thrown no very definite light upon 
the question as to whether these exist in the Malham area. 
The Committee, however, believe that both Malham Cove 
and Aire Head springs are helow the general saturation level 
of the rocks. If so, caverns are only likely to exist, if at all, 
in the upper part of the limestone and above such saturation 
level. Having regard to the character of the rock-joints caverns 
are more likely to exist than large pools. 
L. — Malham Tarn Flushes and Malham Cove. 
Of the problem as to why Tarn flushes should affect Malham 
Cove spring sometimes and not always, Mr. Kendall contributes 
a highly interesting solution. (See Appendix.) 
It is our pleasurable duty to mention that Mr. Morrison's 
aid and advice have been given throughout the investigations at 
Malham, and the Committee have had the active co-operation 
of his steward, Mr. Winskill. 
Appendix. 
Malham Tarn Flushes and Malham Cove. 
by percy f. kendall, f.g.s. 
The behaviour of the water sent down in flushes from 
Malham Tarn demands some attention. In Mr. Tate's experi- 
ments the flushes affected Aire Head in about IJ hours and 
Malham Cove about 38 minutes later. In the experiments 
of this Committee in June, 1899, before the commencement of 
the great drought, a gauge was established at the Cove and 
