Learn to Think"I will think of it．"It is easy to say this．（1）

A

A

We can not see our thoughts，or hear，or taste，or feel them；and yet what mighty power they have!
Sir Isac Newton was seated in his garden on a summer's evening，when he saw an apple fell from a tree．（2）

F

F

Later，he discovered how the earth，sun，moon，and stars were kept in their places．
（3）

C

C

He began to think；he wanted to find out why the steam in the kettle moved the heavy lid．From that time he went on thinking and thinking．When he became a man，he improved the steam engine so much that it could，with the greatest ease，go the work of many horses．
（4）

E

E

A man named Galileo was once standing in the cathedral of Pisa，when he saw a light swaying to and fro．This set him thinking，and it led to the invention of the pendulum．
Boys，when you have a difficult lesson to learn，don't feel discouraged，and help yourselves before asking someone to help you．（5）

B

B

A．But do you know what great things have come from thinking？
B．Think，and by thinking you will learn how to think to some purpose．
C．A boy named James Watt sat quietly by the fireside，watching the lid of the tea kettle as it moved up and down．
D．And do you know how to think？
E．When you see a steamboat，a steam mill，remember that it would never have been built of it had
not been for the hard thinking of someone．
F．He began to think，trying to find out why the apple fell．
G．He was a famous physicist and good at thinking．