His eyes gleamed with excitement and pleasure if a student said anything remotely pertinent or intelligent; but if the student was altogether wrong, as the six of us in his seminar often were, he flinched and scowled as if a bug were flying at his face, or he gazed out a window unhappily, or refilled his pipe, or wordlessly cadged a cigarette from one of us smokers, and hardly even pretended to listen.  

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