76 THE PARALLEL ROADS OF GLEN ROY. 
glacial action as higher up, so that these an¬ 
cient glaciers must have extended not only to 
the sea-shore, but into the ocean, as they do 
now in Greenland. Nor is this all. Scandi¬ 
navian boulders, scattered upon English soil 
and over the plains of Northern Germany, tell 
us that not only the Baltic Sea, but the Ger¬ 
man Ocean also, was bridged across by ice on 
which these masses of rock were transported. 
In short, over the whole of Northern Europe, 
from the Arctic Ocean to the northern bor¬ 
ders of its southern promontories, we find all 
the usual indications of glacial action, showing 
that a continuous sheet of ice once spread over 
nearly the whole continent, while from all the 
mountain-ranges descended those more limited 
glacial tracks terminating frequently in trans¬ 
verse moraines across the valleys, showing, 
that, as the general ice-slieet broke up and 
contracted into local glaciers, every cluster or 
chain of hills became a centre of glacial dis¬ 
persion, such as the Alps are now, such as the 
Jura, the Highlands of Scotland, the moun¬ 
tains of Wales and Ireland, the Alps of Scan¬ 
dinavia, the Hartz, the Black Forest, the Vos¬ 
ges, and many others have been in ancient 
times. 
