150 
angular and rounded stones, which apparently did not fall in from 
above. A rather large stone has been jammed in under a number of 
other stones, some of them erratic. The sides of the joint, where 
exposed, exhibit no appearance of weathering. In the neighbourhood 
there is an un weathered joint from twelve to eighteen inches wide, which 
has been filled to a certain height with grit and stones ; but here, as in 
other places, the infilling matter could not have been washed in by rain. 
8. Another joint filled with grit and stones which could not have 
crumbled down (the sides of the fissm^e up to the top being un weathered) 
or fallen in. At the top of a neighbouring fiUed-up joint there is a 
good-sized cake-shaped stone crammed in, with its upper edge project- 
ing. The form of the rock-surface here, as in many other places, shows 
that rain could not have filled up the joint. 
9. In a large winding passage, the smooth and rounded rocky walls 
run deep down, unaltered inform, beneath the infilling of grit. In one 
part of this passage, six feet wide, the walls are evidently parallel 
jointage-planes, from between which masses of rock must have been 
abstracted, and that not by mere granular dissolution, as this process 
would not have uniformly stopped short at the remaining jointage- 
planes. To attribute the removal of the missing rocks to rain would be 
absurd, seeing that rain has left the jointage-jDlanes intact. It is almost 
Impossible to resist the' impression that these passages must at one time 
have been traversed by waves capable of sweeping away fragments and 
blocks of rock. 
10. In many parts of the ramifying passages near the artificial lakes, 
to which wind and rain have little or no access, a powerful agency, such 
as sea-waves, must have ground away the rocks so as to leave smooth 
and rounded projections and concavities. In front, or facing the lake, 
the rounded form of the cliffs is in many places the same above and 
beneath the talus of loose grit, showing that the talus must have been 
thrown up against the base of the cliffs, or washed down from the loose 
grit covering the top of the cliffs. The latter is not a disintegration in situ. 
11. The cliffs above the lake have in many places been rounded on 
a large scale, irrespectively of the structure of the rock. 
12. At this point rain has lately been washing down loose grit from 
the covering of the upper surface of the stack of rock. Much of the 
grit occupying certain positions at the bases of the cliffs, or in passages, 
has in this way been transferred from the summit, and not derived from 
the weathering of the cliffs. 
13. A great deal of the undermining and roimding has taken place 
along the bases of cliffs rising from ground so flat, or so very slightly 
inclined, as to have prevented the washing away of the resultant de- 
tritus by rain. 
