The smoke is called _carbonic-acid gas_,[A] an invisible vapor, and escapes through the lungs.

The ashes are various waste and poisonous matters which are formed in all parts of the body.

These waste matters are carried out of the body through the skin, the kidneys, the liver, and other organs.
~9.

Another Experiment.~--We cannot see the gas escape from our lungs, but we can make an experiment which will show us that it really does pass out.

Get two drinking-glasses and a tube.