Dr. Rollinson happened to hear this argument, and thought it worth while to inquire further into the matter. Such testimony as he could collect went to confirm the truth of the story. Not only so, but the song itself, if the witnesses were to be believed, so far from being an ordinary childish ditty, was some matter of pretty maids and foaming wine-cups that Tom Moore might have written, and that gentlemen sometimes trolled out, an hour or two after dinner. Now this looked very black for Archibald. Further investigation, however, put a somewhat different face upon the affair. It transpired that the song had been often sung in Archibald's hearing, and before his fit, by the Honorable Richard, for whom, as has been said, the boy had taken a queer fancy. And, perhaps because affection is a good teacher, the boy had acquired the power of repeating some of the verses to himself, of course without understanding a syllable of them, and very likely without himself being conscious of what he was doing, he hummed them over, in short, exactly as a preoccupied parrot might do; and always at a certain time, namely, after he had been put to bed, and was staring up at the darkening ceiling previous to falling asleep. This, by itself, was nothing very remarkable; the puzzle was, how could he do it now? Out of all the wreck of his small memory, why was this song, the meaning of which he had never understood, the sole survivor? Was it that his affection for Mr. Pennroyal had kept it alive? So might a sentimentalist have concluded; but the Doctor was a man of sense. Was it that the boy was shamming? Impossible on all accounts. But then, what was it? The Doctor had by this time worked himself up to believe that the solution of this problem would help largely toward the clearing up of the whole mystery. So he took notes, and continued to observe and to consider. He found, in the first place, that the song-singing took place under exactly the same circumstances as before the fit, and at no other time or place.