Sentence:  The last exciting cause of the <WSD>mercurial</WSD> ulcer, which I shall now mention, is the use of the knife or of the caustic, during a mercurial course, to wounds made or enlarged at this time; for the great additional irritation, which the operation must produce, disposes such wounds to take on easily the <WSD>mercurial</WSD> disease. 
Meaning of the word marked with <WSD> tags:  Caused by the action of mercury or a mercury compound.