"You have erred, perhaps," he observed, taking up a glowing cinder with the tongs and lighting with it the long cherry-wood pipe which was wont to replace his clay when he was in a disputatious rather than a meditative mood--"you have erred perhaps in attempting to put colour and life into each of your statements instead of confining yourself to the task of placing upon record that severe reasoning from cause to effect which is really the only notable feature about the thing."