In case this transition is not understood, one or two tests may be taken at random. The episodes in _Dombey and Son_, the episodes in _David Copperfield_, which came after it, are no longer episodes merely stuck into the middle of the story without any connection with it, like most of the episodes in _Nicholas Nickleby_, or most of the episodes even in _Martin Chuzzlewit_. Take, for instance, by way of a mere coincidence, the fact that three schools for boys are described successively in _Nicholas Nickleby_, in _Dombey and Son_, and in _David Copperfield_. But the difference is enormous. Dotheboys Hall does not exist to tell us anything about Nicholas Nickleby. Rather Nicholas Nickleby exists entirely in order to tell us about Dotheboys Hall. It does not in any way affect his history or psychology; he enters Mr. Squeers's school and leaves Mr. Squeers's school with the same character, or rather absence of character. It is a mere episode, existing for itself. But when little Paul Dombey goes to an old-fashioned but kindly school, it is in a very different sense and for a very different reason from that for which Nicholas Nickleby goes to an old-fashioned and cruel school. The sending of little Paul to Dr. Blimber's is a real part of the history of little Paul, such as it is. Dickens deliberately invents all that elderly pedantry in order to show up Paul's childishness. Dickens deliberately invents all that rather heavy kindness in order to show up Paul's predestination and tragedy. Dotheboys Hall is not meant to show up anything except Dotheboys Hall. But although Dickens doubtless enjoyed Dr. Blimber quite as much as Mr. Squeers, it remains true that Dr. Blimber is really a very good foil to Paul; whereas Squeers is not a foil to Nicholas; Nicholas is merely a lame excuse for Squeers. The change can be seen continued in the school, or rather the two schools, to which David Copperfield goes. The whole idea of David Copperfield's life is that he had the dregs of life before the wine of it. He knew the worst of the world before he knew the best of it. His childhood at Dr. Strong's is a second childhood. Now for this purpose the two schools are perfectly well adapted. Mr. Creakle's school is not only, like Mr. Squeers's school, a bad school, it is a bad influence upon David Copperfield. Dr. Strong's school is not only a good school, it is a good influence upon David Copperfield. I have taken this case of the schools as a case casual but concrete. The same, however, can be seen in any of the groups or incidents of the novels on both sides of the boundary. Mr. Crummles's theatrical company is only a society that Nicholas happens to fall into. America is only a place to which Martin Chuzzlewit happens to go. These things are isolated sketches, and nothing else. Even Todgers's boarding-house is only a place where Mr. Pecksniff can be delightfully hypocritical. It is not a place which throws any new light on Mr. Pecksniff's hypocrisy.