The Alchemical Essence and the Chemical Element: An Episode in the Quest of the Unchanging

accurate alchemical essence alchemists alchemy ammonium cyanate aqua fortis aqua regia arranged asserts atomic weights black solid bluestone burning body burning lead calcination called carbonic acid changes in combinations charcoal CHEMICAL ELEMENT chemist chemistry common air composed copper definite kinds definite numbers different kinds disappeared distinct kinds earth elementary particles equal existed explanation fancies formed by putting gold heated hydrogen invisible elements iron kinds of matter Lavoisier lead and oxygen lightest element liquid litharge living power material system material things mercury and sulphur metals middle nature minute particles natural facts nitrogen notion obtained oil of vitriol ordinary sulphur Paracelsus particle of water perfect phlogiston piece portions Priestley principle of fire principle of malleability produced quantities by weight quicksilver red precipitate remote matter separated seven elements smaller particles substance is burnt Subtle sulphide of mercury Surly sweet thou tion ultimate particles unchanging particles universal urea variations vessel wit and reason