Plate XIII 



DISCONTINUITIES WHICH CAUSE THE APPEARANCE UK WHITK ICE 



IN THE WALLS OF THE GROTTO IN WINTER. 



Fig. 10. Shows a very remarkable picture of these discontinuities 

 in the north wall about two metres from the entrance. 



Fig. ii. Overlaps Fig. 10 a little and shows the comparative absence 

 of White Ice one or two metres further in. 



