"I have in my pocket a manuscript," said Dr. James Mortimer."I observed it as you entered the room," said Holmes."It is an old manuscript.""Early eighteenth century, unless it is a forgery.""How can you say that, sir?""You have presented an inch or two of it to my examination all the time that you havebeen talking. It would be a poor expert who could not give the date of a document within adecade or so. You may possibly have read my little monograph...