Elements of scientific agriculture; or, Elements of scientific agriculture; or, The connection between science and the art of practical farming elementsofscient01nort Year: 1851 8 METHOD OF COLLECTING GAS. marked by the dotted lines c (this may be a common pail, or shallow water tub). A tumbler or other con- venient vessel is now filled with water, and inverted under the surface, so that it may contain no air, being filled entirely with water : it is then brought carefully over the orifice of the tube, and the ascending bubbles of gas displace the water until it is entirely driven out, the ga
Elements of scientific agriculture; or, Elements of scientific agriculture; or, The connection between science and the art of practical farming elementsofscient01nort Year: 1851 8 METHOD OF COLLECTING GAS. marked by the dotted lines c (this may be a common pail, or shallow water tub). A tumbler or other con- venient vessel is now filled with water, and inverted under the surface, so that it may contain no air, being filled entirely with water : it is then brought carefully over the orifice of the tube, and the ascending bubbles of gas displace the water until it is entirely driven out, the gas remaining confined. If a little shelf, hollowed somewhat underneath, and with a hole through it at the highest point of the hollow, be placed in the cis- tern, three or four vessels in succession may be-filled over this hole and set aside for use, keeping the mouths always under water. A common tub of a shallow form w^ill answer the purpose of a cistern. I have been thus particular in describing this little apparatus of the cistern, because all of the other gases concerning which we are to study may be received in the same way. It is perfectly effective, yet at the same time simple and cheap. The hydrogen being thus collected, we are next to ascertain what are its properties. 1. It is inflammable : if a lighted taper be plunged into a jar of it, the gas~ will instantly take fire, and burn with a pale flame. This may also be shown by Fig 2. removing the cork from the bottle a in fig. 1, and substituting another cork with a short tube coming to a point as fig. 2. A match will kindle the jet of gas issuing from the orifice a, and it will continue to burn so long as the generation of gas within the bottle is active. 2. Although inflammable itself, it is not a supporter of combustion. The taper which kindles a jar of it, is it- self extinguished. 3. It is much lighter than common air, being the
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