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consisted of portions of the coprolite bed transported in an 
unscattered condition from their original positions, shewing 
that some agency must have acted upon them to push them 
laterally over the surface, different from that of running water, 
whether in the form of rivers or of rain. And since it is evident 
that the same agent which has moved the superficial beds must 
be that which was engaged in the work of denudation, it was 
argued that rain and rivers have not been the sole influences to 
which the configuration of the landscape is due. 
The previously published papers of the author on this sub- 
ject point to land-ice as the denuding agent, and give reasons 
for supposing that the climate may have been sufficiently 
rigorous for such a condition about 100,000 years ago. 
Mr Bonney expressed an opinion that the principal features 
of the district might more easily be accounted for by the action 
of lateral streams, aided by rain, at a period when the rainfall 
was greater than at present, and that the contortions and dis- 
turbances of the bed would better be explained by the ground- 
ing of small bergs floated off from an ice-foot than by the 
pressure of a glacier passing down the valley. He also thought 
it improbable that the valley had been occupied by a glacier 
since the Boulder clay period. 
Mr FisHER replied that he could not interpret the pheno- 
mena as indicative of other than the action of an ice-sheet such 
as now enveloped parts of Greenland. 
With reference to Professor Liveing’s communication, Mr 
Fisher thought that the formation of the pipe at Alum Bay 
might be referred to the period of the Thanet Sands, which are 
unrepresented in the Isle of Wight, when denudation would 
naturally be taking place in that locality. 
