water jet in a vacuum fill an empty bottle about three quarters full of water the cork must be pierced with a bit of sound straw or hollow grass or a few inches of glass piping of small diameter in any caso case how the jet 0 of water will look this tube must descend near the hot bot torn tora of the bottle hermetically sear seaf the cork with varnish or sealing wax now cover dour our flask with a large pickle bottle upside down which must first be warmed over a lamb or candle flame in order to prevent the air from getting in it must be placed on a i few sheets of wet blotting paper smoothly ly laid on a plate press the pickle bottle firmly down on an the blot ting paper so as to exclude all air now in a minute or two the con tract traction fon of the inner air from the cool ing ng of the bottle will cause a jet of water to issue from the medicine bot tie tle an automatic fountain and if it the directions have been strictly ad hered to you vill perceive it break nto into a drops of liquid crystal