phlogiston

He thought they were "compounded" of a certain earth, or calx, and phlogiston.

It was phlogiston and that only which occasioned the electric current.

I should have sent you my Defence of Phlogiston, but that I presume you have seen it.

Coal, for example, was thought to be very rich in phlogiston.

"Phlogiston" and "vortices" had their day and are forgotten.

Phosphorus then must consist, say the Stahlians, of Phlogiston and this acid.

Metals then were regarded as compounds of calces and phlogiston.

What is this but common air completely deprived of phlogiston?

When a substance burns, phlogiston, it was said, rushes out of it.

But how is such a restoration of phlogiston to be accomplished?