This seems to be quite an easy matter. The one who tries it will probably blow as hard as possible upon the little cork; but, instead of going into the bottle, as expected, it will simply fall down. The harder the puffs or blows, the more obstinate the cork will appear to be; and even if the effect of blowing gently be tried, it will be of no use; the cork will not go into the bottle, much to the amusement of those who are watching. The reason why the cork will not go in is this: The bottle being already full of air, when the cork is blown, more air will be forced into the bottle, and consequently the air inside will be greatly compressed and will simply force the cork back. The following is a simple way of overcoming the difficulty: Instead of trying to force the cork through the compressed air in the bottle, just the contrary should be tried, that is, some of the air should be sucked out of the bottle; this being done, the bottle will become partly emptied, and when the outside air rushes in to fill up the empty space, it will carry the cork with it to the bottom of the bottle.