The Secret of a Cryptogram

My uncle tore the paper from me and examined it attentively for a long time. What does it all mean? He kept repeating mechanically. Only think that under this jargon there may lie concealed the clue to some great discovery. As for me, I was of opinion then. There was nothing at all, in it. Though, of course, I took care not to say so. Then the professor took the book and the parchment, and diligently compared them together. These two writings are not by the same hand, he said. The cipher is of later date than the book, an undoubted proof of which I see in the moment. But who was that professor? It is his name,