Source : Webster's Revised Unabridged Dictionary (1913)

Sulphite \Sul"phite\, n.
   A person who is spontaneous and original in his habits of
   thought and conversation. [Slang] -- {Sul*phit"ic}, a.
   [Slang]

         A sulphite is a person who does his own thinking, he is
         a person who has surprises up his sleeve. He is
         explosive.                               --Gelett
                                                  Burgess.