Page "Phlogiston theory" Paragraph 4

Joseph Black's student Daniel Rutherford discovered nitrogen in 1772 and the pair used the theory to explain his results.

The residue of air left after burning, in fact a mixture of nitrogen and carbon dioxide, was sometimes referred to as " phlogisticated air ", having taken up all of the phlogiston.

Conversely, when oxygen was first discovered it was thought to be " dephlogisticated air ", capable of combining with more phlogiston and thus supporting combustion for longer than ordinary air.