A chapter (capitula in Latin; sommaires in French) is any of the main thematic divisions within a writing of relative length, such as a book of prose, poetry, or law. A chapter book may have multiple chapters that respectively comprise discrete topics or themes. In each case, chapters can be numbered, titled, or both. An example of a chapter that has become well known is "Down the Rabbit-Hole", which is the first chapter from Alice's Adventures in Wonderland. History of chapter titles Many ancient books had neither word divisions nor chapter divisions. In ancient Greek texts, some manuscripts began to add summaries and make them into tables of contents with numbers, but the titles did not appear in the text, only their numbers. Some time in the fifth century CE, the practice of dividing books into chapters began. Jerome (d. 420) is said to use the term capitulum to refer to numbered chapter headings and index capitulorum to refer to tables of contents. Augustine did not divide his major works into chapters, but in the early sixth century Eugippius did. Medieval manuscripts often had no titles, only numbers in the text and a few words, often in red, following the number. Chapter structure Many novels of great length have chapters. Non-fiction books, especially those used for reference, almost always have chapters for ease of navigation. In these works, chapters are often subdivided into sections. Larger works with a lot of chapters often group them in several 'parts' as the main subdivision of the book. The chapters of reference works are almost always listed in a table of contents. Novels sometimes use a table of contents, but not always. If chapters are used they are normally numbered sequentially; they may also have titles, and in a few cases an epigraph or prefatory quotation. In older novels it was a common practice to summarise the content of each chapter in the table of contents and/or in the beginning of the chapter. Unusual numbering schemes In works of fiction, authors sometimes number their chapters eccentrically, often as a metafictional statement. For example: Seiobo There Below by László Krasznahorkai has chapters numbered according to the Fibonacci sequence. The Curious Incident of the Dog in the Night-Time by Mark Haddon only has chapters which are prime numbers. At Swim-Two-Birds by Flann O'Brien has only one chapter: the first page is titled Chapter 1, but there