You who read this may have met with some cross-chance such as we are going to try to describe to you; possibly with the same effect upon yourself as the one we have to confess to in our own case--namely, that you have been left face to face with a problem to which you have never been able to supply a solution. You have given up a conundrum in despair, and no one has told you the answer. Here are the particulars of an imaginary case of the sort. You have made acquaintance--made friends--years ago with some man or woman without any special introduction, and without feeling any particular curiosity about his or her antecedents. No inquiry seemed to be called for; all concomitants were so very usual. You may have felt a misgiving as to whether the easy-going ways of your old papa, or the innocent Bohemianisms of his sons and daughters will be welcome to your new friend, whom you credit with being a little old-fashioned and strait-laced, if anything. But it never occurs to you to doubt or investigate; why should you, when no question is raised of any great intimacy between you and the So-and-sos, which may stand for the name of his or her family. They ask no certificate from you, of whom they know just as little. Why should you demand credentials of a passer-by because he is so obliging as to offer to lend you a Chinese vocabulary or Whitaker? Why should your wife try to go behind the cheque-book and the prayer-book of a married couple when all she has had to do with the lady was, suppose, to borrow a square bottle of her, marked off in half-inch lengths, to be shaken before taken? Why not accept her unimpeachable Sunday morning as sufficient warranty for talking to her on the beach next day, and finding what a very nice person she is? Because it would very likely be at the seaside. But suppose any sort of introduction of this sort--you know what we mean! Well, the So-and-sos have slipped gradually into your life; let this be granted. We need not imagine, for our purpose, any extreme approaches of family intimacy, any love affairs or deadly quarrels. A tranquil intercourse of some twenty years is all we need, every year of which has added to your conviction of the thorough trustworthiness and respectability of the So-and-sos, of their readiness to help you in any little difficulty, and of the high opinion which the rest of the world has of Mr. and Mrs. So-and-so--the world which knew them when it was a boy, and all their connexions and antecedents, which, you admit, you didn't....