CUTTRISS : NOTES ON THE CAVES OF YORKSHIRE. 443 
therefore, merely determined. The results showed a slight 
deficiency of oxygen in the air from below, but the difference 
was not very large. 
Referring to the diagrams, these must not be accepted as 
absolutely correct, but merely as sketch plans, drawn partly from 
memory and notes, with a few dimensions taken at the time. 
Owing to the difficulty of the descent there was no opportunity 
to make careful surveys, neither were the mental faculties in 
a condition to undertake such work. Fig. 1 shows the surface 
outline of the opening, and figs. 2, 3, 4, are plans at various 
levels, the relative positions of the surface opening being shown 
in dotted lines. The vertical section in particular is merely 
intended to represent the various levels, as, owing to the 
tortuous character of the fissures, a true section is impossible. 
