NATURE FOR ITS OWN SAKE 
The green 
hills. 
English 
hills. 
worn-down mountain, or it may be mere glacier 
push, or again, it may be a hard core of rock 
that has defied the wear of water. The va- 
riety of hills is even greater than that of moun- 
tains. Often they are banded together in 
groups or chains and dignified with the name 
of ‘‘mountains ;” sometimes they are in clus- 
ters and lie nestled together along a river’s 
course ; and sometimes they rise singly from a 
flat basin or plain. They almost always show 
the effects of erosion, and, indeed, the marks 
of the streams about their bases and sides can 
be easily traced. The tops and sides, washed 
by rains, have enough soil for vegetation, and 
trees or coverings like the heather grow readily 
upon them. Every country has its different 
kinds of hills, and in Great Britain almost 
every shire will show a new species. The bare 
cliff-hills along the English Channel near the 
Isle of Wight, so clear and pure and beautiful 
in their sky lines, are different from the rugged 
hills of Scotland, with great bowlders sunk 
in the purple heather of the peat-beds ; and 
every traveller must have noticed the change 
from the flat hills of Suffolk to the abrupt 
ranges of Derbyshire. 
The damp climate and the heavy rainfalls of 
