98 THE FAIRY-LAND OF SCIENCE. 
icebergs. Through all this, while it is being carried 
hither and thither by invisible power, we find no trace 
of its becoming worn out, or likely to rest from its 
labours. Ever onwards it goes, up and down, and 
round and round the world, taking many forms, and 
performing many wonderful feats. We have seen 
seme of the work that it does, in refreshing the air, 
feeding the plants, giving us clear, sparkling water to 
drink, and carrying mattei to the sea ; but besides 
this, it does a wonderful work in altering all the face 
of our earth. This work we shall consider in the 
next lecture, on "The two great Sculptors Water 
and Ice." 
