THE TWO GREAT SCULPTOXS. m 
pens also all over the world. Up in the mountains, 
where there is always a great deal of rain, little rills 
gather and fall over the mountain sides, meeting in 
some stream below. Then, as this stream flows on, it 
is fed by many runnels of water, which come from all 
parts of the country, trickling along ruts, and flowing 
in small brooks and rivulets down the gentle slope of 
the land till they reach the big stream, which at last 
is important enough to be called a river. Sometimes 
this river comes to a large hollow in the land and there 
the water gathers and forms a lake; but still at the 
lower end of this lake out it comes again, forming a 
new river, and growing and growing by receiving fresh 
streams until at last it reaches the sea. 
The River Thames, which you all know, and whose 
course you will find clearly described in Mr. Huxley's 
" Physiography," drains in this way no less than one- 
seventh of the whole of England. All the rain which 
falls in Berkshire, Oxfordshire, Middlesex, Hertford- 
shire, Surrey, the north of Wiltshire and northwest of 
Kent, 'the south of Buckinghamshire and of Glouces- 
tershire, finds its way into the Thames ; making an 
area of 6160 square miles over which the water of every 
little rivulet and brook finds its way down to the one 
great river, which bears them to the ocean. And so 
with every other area of land in the world there is some 
one channel toward which trie ground on all sides 
slopes gently down, and into this channel all the water 
will run, on its way to the sea. 
But what has this to do with sculpture or cutting 
out of valleys? If you will only take a glass of water 
out of any river, and let it stand for some hours, you 
