"Yes," said Rollo, "I know it is. And now for the third experiment, Jonas."
"The third experiment," said Jonas, "is this. Turn the bellows bottom upwards, and try to blow."
Nathan did so. He found that he could work the bellows easily—too easily, in fact; but they did not blow.
"Hold your hand opposite the nose, and see if any wind comes," said Jonas.
They did so; there was no wind, or rather scarcely any.
"The reason is," said Jonas, "that, when the bellows are bottom upwards, the valve hangs down off from the hole all the time, and lets the air all out through the hole in the side; and it can come out more easily there than through the nose, and so it don't blow well."
"Well, Jonas," said Rollo, "that's a pretty good experiment; but what is the next? Let me try the next. Nathan, it is my turn."
"The next experiment, which is the fifth,——"
"No, the fourth," said Nathan.
"The fourth, then," said Jonas, "is to prove what I said to you—that the air, which is blown out at the nose of the bellows, really comes in through the valve. Let me see,—I want something to make a smoke."