“He paused and looked anxiously in my face. 'Sometimes,' he continued, 'it is played softly, sometimes loudly, but always quickening to a long-roll, so loud and alarming that I have looked to see people coming into my room to ask what was the matter. But I think, Doctor,--I think,' he repeated slowly, looking up with painful interest into my face, 'that no one hears it but myself.' “I thought so, too, but I asked him if he had heard it at any other time. “'Once or twice in the daytime,' he replied, 'when I have been reading or writing; then very loudly, as though it were angry, and tried in that way to attract my attention away from my books.' “I looked into his face, and placed my hand upon his pulse. His eyes were very bright, and his pulse a little flurried and quick. I then tried to explain to him that he was very weak, and that his senses were very acute, as most weak people's are; and how that when he read, or grew interested and excited, or when he was tired at night, the throbbing of a big artery made the beating sound he heard. He listened to me with a sad smile of unbelief, but thanked me, and in a little while I went away. But as I was going down stairs, I met the Professor. I gave him my opinion of the case,--well, no matter what it was. “'He wants fresh air and exercise,' said the Professor, 'and some practical experience of life, sir?' The Professor was not a bad man, but he was a little worried and impatient, and thought--as clever people are apt to think--that things which he didn't understand were either silly or improper. “I left the city that very day, and in the excitement of battle-fields and hospitals, I forgot all about little Rupert, nor did I hear of him again, until one day, meeting an old classmate in the army, who had known the Professor, he told me that Rupert had become quite insane, and that in one of his paroxysms he had escaped from the house, and as he had never been found, it was feared that he had fallen in the river and was drowned. I was terribly shocked for the moment, as you may imagine; but, dear me, I was living just then among scenes as terrible and shocking, and I had little time to spare to mourn over poor Rupert. “It was not long after receiving this intelligence that we had a terrible battle, in which a portion of our army was surprised and driven back with great slaughter. I was detached from my brigade to ride over to the battle-field and assist the surgeons of the beaten division, who had more on their hands than they could attend to. When I reached the barn that served for a temporary hospital, I went at once to work. Ah, Bob,” said the Doctor, thoughtfully taking the bright sword from the hands of the half-frightened Bob, and holding it gravely before him, “these pretty playthings are symbols of cruel, ugly realities.