She said, "I am sorry that the coffee is cold. It is because the
servant forgot to scour the coffee-pot. Coffee gets cold more quickly
when the coffee-pot is not bright."

This set Franklin to thinking. He thought that a black or dull thing
would cool more quickly than a white or bright one. That made him
think that a black thing would take in heat more quickly than a
white one.

He wanted to find out if this were true or not. There was no-body who
knew, so there was no-body to ask. But Franklin thought that he would
ask the sunshine. Maybe the sunshine would tell him whether a black
thing would heat more quickly than a white thing.

But how could he ask the sunshine?

There was snow on the ground. Franklin spread a white cloth on the
snow. Then he spread a black cloth on the snow near the white one.
When he came to look at them, he saw that the snow under the black
cloth melted away much sooner than that under the white cloth.

That is the way that the sunshine told him that black would take in
heat more quickly than white. After he had found this out, many people
got white hats to wear in the summer time. A white hat is cooler than
a black one.

Some time when there is snow on the ground, you can take a white and a
black cloth and ask the sunshine the same question.