Sentence:  This is the sort of struggle which proves a man's metal, and declares it sterling or counterfeit. No <WSD>spuriosity</WSD>, no charlatanry can stand this fiery alembic of hard-wrought and exquisite calculation, in which one mathematic point or unit misplaced destroys the whole chain of reasoning, and proves the candidate a blunderer. 
Meaning of the word marked with <WSD> tags:  Spuriousness.