The novels of the 19th Century make up the core of what is considered classic literature in the western world. The novel as a genre had just been developed in the previous century and through the 19th Century the traditional form of the novel was developed by authors such as Jane Austen, Charlotte Brontë, Charles Dickens, and Emile Zola. In the next century the form is generally codified and then, as always happens when any form of art is defined and restricted, modern writers began to break the rules and in doing so, extend the definition of what is termed the novel.
Long ago, however, I learned that you can’t understand how the rules are broken unless you’re well versed in the rules themselves. Thus it is important to understand the novel as written in the 19th Century if you want to understand and enjoy the advancement of the form in the 20th Century.