212 PROOFS OF THE PROPERTIES OF NITROGEN GAS.

and quality of the gazeous bases, but to a difference in theirunion; in the atmosphere the union of the two gases is a truechemical combination, but in our experiments the mass of theformed air is a mere mechanical mixture.

Experiment VI.

Nitrogen gas does not precipitate lime from lime-water.

This may be proved by putting a quantity of lime-water intoa tube filled with the gas and shaking it. The transparency ofthe lime-water will not be injured.