Rollo's Philosophy. [Air]

eriments, which we can perform with the bellows. I will be the professor, and you tw

he bellows with your hand, in such a way as to put your thumb ov

sily; but when he attempted to press the sides together again, he could not. He crowded

it do so?"

tops itself. Rollo stops the nose with his thumb, and I have nailed the leather down close, about all

l his strength. The sides

coming,

, just as fast as the air can leak out

opped all the lea

tly tight. Some air can escape between the leather and the nails all around, and just

is strength; but he could only bri

is trying to press the two handles together, you, Rollo, may

wed the air to escape through the opening. The consequence was, that the bel

ept in, you cannot bring the sides together; but whe

athan; "do it

the nose, to keep the air from issuing through. Then Nathan tried to press them together; but he could not, un

thing, I verily bel

w it is. And now for the

as, "is this. Turn the bellows b

ld work the bellows easily-too easi

the nose, and see if an

was no wind, or r

down off from the hole all the time, and lets the air all out through the hole in the sid

y good experiment; but what is the next? L

riment, which

ourth," sa

the air, which is blown out at the nose of the bellows, really come

paper do?"

as rolled it up, and told Rollo to set it on fire, and then, when it

a heap, making a great smoke upon

the paper, so as to have the valve near the smoke, and then hold

, so that Rollo could blow. He then directed Rollo to lean the bellows over a little toward

will see that the smoke will be drawn in through

y knew at once that this bell was for Rollo and Nathan; and so the two boys jumped up from the hearth, and ran out to see what was wanted. They went through the shed into the barn, and thence

athan?" sa

Nathan was coming along, as fas

ant us?"

here you were. You may stay half an hour mo

d not blow in; and Rollo and Nathan looked out for some time, watching the falling snow, and listening to the wind,

hide, and then Jonas wi

id Nathan,

in one corner, and a tool-room near it, and lofts and scaffolds above. The boys found plenty of places to hide in, and it took them some time to decide which to choose. At last, they found a good

t Jonas was about. So they went down stairs on tiptoe; Rollo first, and Nathan following. They crept softly along to the door leading out into the s

aid he, "this do

fastened?"

it. I think he must have finished his work, and gon

t come and find

front door. And I don't care much," he con

door of the barn, and, to their surpr

us in." As Rollo said this, his face assumed an expr

nd some way to get out. But I don't see,

the barn, as he usually did when he left the shop. He then came around to the front barn door, and although that was on the sheltered side, so that the wind did not blow in, he thought it possible that the wind might change, and so drive the snow in upon the barn floor; and therefore,

o find some place where he could get out

irs," said he, at

up stairs," said Nathan. "It wou

find out some way to get down. O, there is a ladder; I remember now, Na

to go down the la

"I will go first, an

lo could not get it open. He told Nathan that, if he could only get it open, and could find a long pole, he could reach

it happened that this window was upon that side of the barn which was exposed to the wind and storm; and, the moment that Rollo had pushed open the shutter a little w

looked somewhat astonished at such an

u had had hold of that shutter, you would

d, Rollo; that was t

the window. When the lower end reached the ground, the upper end was two or three feet above the bottom of the window; so that Rollo could easily get upon it to descend. The wind and storm, which raged with great violence, were somewhat terrifyin

Nathan, for

fraid to have him make the attempt. While they were standing i

ol

saw Dorothy stan

doing, Rollo?"

t Nathan out of th

in the barn?"

to come down the ladder; but Nathan

to the door, and l

that. Go down, Nathan," he continued, "to the d

ng him there, knocked out the fid, an

STI

hat was the second experiment? What was the effect produced by turning the bellows bottom upwards, as in the third experiment? What was the fourth experiment? What was th

to co