30 
GLACIAL PERIOD. 
them with turf, grassed them over, planted 
them with trees, sown his seed and gathered 
in his harvests upon them, until at last they 
make a part of the undulating surface of the 
country. Were it not for anticipating my 
story, I could point out many a green billow, 
rising out of the fields and meadows immedi¬ 
ately about us, that had its origin in the old 
ice-time. Thus disguised, they are not so evi¬ 
dent to the casual observer; but, nevertheless, 
when once familiar with the peculiar form, 
character, and position of these rounded ridges 
scattered over the face of the country, they are 
easily recognized. 
Of course the ancient glaciers of Great 
Britain were far more difficult to trace than 
those of Switzerland, where the present glaciers 
are guides to the old ones. Nevertheless, my 
expectations were more than answered. The 
first valley I entered in the glacial regions of 
Scotland was barred by a terminal moraine; 
and throughout the North of England, as well 
as in Scotland and Ireland, I found the hill¬ 
sides covered with traces of glacial action, as 
distinct and unmistakable as those I had left 
in my native land. Not only was the surface 
