ful. He sprang to his feet, drew and opened
            a sailor's clasp-knife, and balancing it open on the palm of his hand,
            threatened to pin the doctor to the wall.</p>
            <p><a name="id380532"><!--anchor--></a>The doctor never so much as moved. He spoke to him as before, over his
            shoulder and in the same tone of voice, rather high, so that all the
            room might hear, but perfectly calm and steady: "If you do not put that
            knife this instant in your p