5. From that time he went on thinking and thinking; and
when he became a man, he improved the steam engine so
much that it could, with the greatest ease, do the work of
many horses.
6. When you see a steamboat, a steam mill, or a
locomotive, remember that it would never have been built if
it had not been for the hard thinking of some one.
7. A man named Galileo was once standing in the
cathedral of Pisa, when he saw a chandelier swaying to and
fro.

THIRD READER. 103
8. This set him thinking, and it led to the invention of the
pendulum.
9. James Ferguson was a poor Scotch shepherd boy. Once,
seeing the inside of a watch, he was filled with wonder.
"Why should I not make a watch?" thought he.
10. But how was he to get the materials out of which to
make the wheels and the mainspring? He soon found how to
get them: he made the mainspring out of a piece of
whalebone. He then made a wooden clock which kept good
time.
11. He began, also, to copy pictures with a pen, and
portraits with oil colors. In a few years, while still a small
boy, he earned money enough to support his father.
12. When he became a man, he went to London to live.
Some of the wisest men in England, and the king himself,
used to attend his lectures. His motto was, "I will think of it;"
and he made his thoughts useful to himself and the world.
13. Boys, when you have a difficult lesson to learn, do n't