ATMOSPHERIC PRESSURE.
{"newspaper_name": "The Litchfield County post.", "edition": "01", "page": "p1", "byline": ""}
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The pressure or weight of the atmosphere, as shown by the barOmetar, the sucking and air pumps, is near fifteen pounds on every square inch, so that if we could entirely squeeze out the air between our two hands, they would cling together with force equal to the pressure of double this weight, be-

 cause the air would press upon both hands; ; and if we could contrive to suck or squeeze out the air between one hand and the wall, the hand would stick fast to the wall. being pressed on it with weight above two hund

 red weight, that is, near l5 pounds on every square inch of the hand. By a late most cu- rious discovery of Sir sEverard Home, it is found that this is the very process by which flies and other insects of similar description are enabled to walk up purpendicuIar surfaces, however smooth, as the sides of walls and panes of glass in windows, and to walk as ea- silly along the ceiling of a room with their bO- dies dOwnwards and their feet over head. Their feet when examined by a microscope, are found to have fiat skin or flaps, like the feet of web-foOted animals, ,as ducks and geese; and they have towards the back part or heels, but inside of the skin or flap, two very small toes, so connected with the flap as to draw it close down upon the glass or wall the fly walks on, and to squeeze out the air com pletely, so that there is vacuum made be tween the foot and wall. The heconsequence is, that the air presses the foot on the wall with force greater than the weight of the fly,