Remember, then, Nathan and Rollo, that, when a fire is built in a fireplace, so as to warm the air in the chimney, it makes this air not so heavy and then the cool air all around it in the room and out of doors, presses in, and crowds under the light air, and makes it ascend.O yes, said his father the key hole of the door is a little opening, and there is a narrow crevice all around the door and you will find little crevices around the dog leash link suggest windows.He said he meant to make a crevice and so he pushed up the window a very little way, and held the lamp opposite to the opening.They were building with sticks of dog leash link suggest wood, which they piled in various ways, so as to make houses.That is, if the cylinder was full of air when he put the piston in, perhaps he could get the piston down half way to the bottom.Besides, the dog leash link suggest fire would burn 'em.At length he said, And now, father, haven't you almost done telling about the air? Why, yes, said his father I have told you enough for this time only you must remember it all.The air all around us is pressed down by the dog leash link suggest load of all that is above us.I have read about balloons bigger than a house.How dog leash link suggest high? said Rollo.No, replied his father, the water cannot be sensibly compressed.The little tuft of down was wafted up into the air, quite high dog leash link suggest above the lamp, and then it sailed slowly away, and fell down upon the table.An iron vessel, shaped like a tumbler, only as large at the bottom as it is at the top, would be a cylinder.Would dog leash link suggest it! exclaimed Rollo and Nathan together.