His pleasant neatness and compactness, his small hands and feet, his teeming ready brain, his unaffected accessibility, and a certain fine apprehensiveness which stamped him as susceptible from his topmost hair to his tipmost toe, proved irresistible.
There are no more uses of "susceptible" in the play.
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susceptible to colds
Not being susceptible to contradicting evidence, it is not a testable hypothesis.