Sentence:  For some days a "fistula lacrymalis" had come into my left eye, which discharged an <WSD>humour</WSD>, when pressed, that portended danger. 
Meaning of the word marked with <WSD> tags:  Any of the fluids in an animal body, especially the four "cardinal humours" of blood, yellow bile, black bile and phlegm that were believed to control the health and mood of the human body.