YS ay 
1905-6. j Is BELIEF IN A GLACIAL PERIOD JUSTIFIED? 289 
But we may look in vain for any indications of the agency of ice, such 
as the rounded and polished surfaces of Rochés Moutonnées or the flattened 
and more highly polished Rochés nivelées, for terminal, lateral or medial 
moraines, such as we find in Switzerland, for straight striae markings 
with little or no lateral deviations, and particularly without cross hatching, 
or for boulders with flat sides and scratches upon them. Thus I claim 
that the glacial theory which-in 1871 was accepted by Geikie as ‘‘the 
only theory which seems to satisfy all the requirements of our present 
knowledge,’ has lived its day and with our now maturer knowledge, 
should be superseded by that of water, acting in sudden potential débacles, 
which is the only theory that I know, which seems to satisfy our present 
requirements, and which is thoroughly in keeping with the well known 
power and action of that element. 
