His very heart was bleeding, and it took all the manhood of him⁠—and there was a royal lot of it, too⁠—to keep him from breaking down. I paused before answering, for I felt that I must not betray anything which the Professor wished kept secret; but already he knew so much, and guessed so much, that there could be no reason for not answering, so I answered in the same phrase: “That’s so.”