Stahl's first definition of phlogiston first appeared in his , published in 1697. His most quoted definition was found in the treatise on chemistry entitled in 1723. According to Stahl, phlogiston was a substance that was not able to be put into a bottle but could be transferred nonetheless. To him, wood was just a combination of ash and phlogiston, and making a metal was as simple as getting a metal calx and adding phlogiston. Soot was almost pure phlogiston, which is why heating it with a metallic calx transforms the calx into the metal and Stahl attempted to prove that the phlogiston in soot and sulphur were identical by converting sulphates to liver of sulphur using charcoal. He did not account for the increase in weight on combustion of tin and lead that were known at the time.
stahl's first definition of phlogiston first appeared in his  published in 1697 his most quoted definition was found in the treatise on chemistry entitled in 1723 according to stahl phlogiston was a substance that was not able to be put into a bottle but could be transferred nonetheless to him wood was just a combination of ash and phlogiston and making a metal was as simple as getting a metal calx and adding phlogiston soot was almost pure phlogiston which is why heating it with a metallic calx transforms the calx into the metal and stahl attempted to prove that the phlogiston in soot and sulphur were identical by converting sulphates to liver of sulphur using charcoal he did not account for the increase in weight on combustion of tin and lead that were known at the time