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Attached to the combustion tube is a weighed tube containing chloride of calcium, a substance which greedily combines with water, and this tube is succeeded by a set of three or more small bulbs, blown in one piece of glass, and containing an aqueous solution of caustic potash, a substance with which carbonic acid readily enters into combination.

What is sold as Jena combustion tube should be preferred when this is the case.

The Use of Combustion Tube.—It is often necessary to construct apparatus of what is known as hard glass or combustion tube.

It is almost as easy to work combustion tube as to deal with lead and soda glass if the oxy-hydrogen flame be employed.

Difficultly volatile liquids may be weighed directly into the boat; volatile liquids are weighed in thin hermetically sealed bulbs, the necks of which are broken just before they are placed in the combustion tube.