The truth was, that Jonas did not know that the boys were in the barn when he fastened it up.Yes, interrupted Rollo, just like water, only thinner, because, you see You must not interrupt me, said his father, unless to ask some question, lemon tea bread which is necessary to understand what I say.The door opened in such a direction, that the wind did not blow in and Rollo and Nathan looked out for some time, watching the falling snow, and listening to the wind, as it roared through the tops of the trees.What was the first experiment with the bellows, described in this chapter? Why could not Nathan press the two sides of the bellows together, while the nose was stopped? What was the second experiment? What was the effect produced by turning the bellows bottom upwards, as lemon tea bread in the third experiment? What was the fourth experiment? What was the use of the smoke of the paper? How were the experiments interrupted? What evidence did Rollo and Nathan have that the air was a real substance, when in the barn chamber? CHAPTER V.He saw that there was a little clapper over the hole, in one of the sides of the bellows.Then he laid this down over the lemon tea bread hole.I shall be afraid to go down the ladder, said Nathan.Let us stop up the key hole, said Rollo, and lemon tea bread then it can't get in.What makes it go out at all? said Nathan.I will be the professor, and you two shall lemon tea bread be my class in philosophy, and I will direct you how to make the experiments.It can't go out of the hole whence it came in, because the clapper stops it up, and so it goes out the long nose, right into the fire, and makes the fire burn.When this was done, Jonas told Nathan to take hold of the nose of the bellows, to steady it, so that Rollo lemon tea bread could blow.Well, then, said Jonas, when I lift up the upper side of the bellows by the handle, to blow, the air comes in by the hole.They're coming, lemon tea bread said he.Is that a leak? said Nathan.