"Yes," said his father. "He filled it with hot air; and the hot air was so light, that it rose up and carried the paper ball with it."
"How did he get the hot air into it?" said Rollo.
"Why, he held it over a little fire, with the mouth down. Then the hot air from the fire went up into the ball, and swelled it out full."
"How high did it go?" said Nathan.
"O, it soared away," said his father, "away up into the air, very high; until at length it got cool, and then it came down."
"I should like to see such a ball as that," said Nathan.
"Such a ball as that is called a balloon," said his father.
"I wish I could see a balloon," said Nathan.