Longer essays may also contain an introductory page that defines words and phrases of the essay's topic. Most academic institutions require that all substantial facts, quotations, and other porting material in an essay be referenced in a bibliography or works cited page at the end of the text. This scholarly convention helps others (whether teachers or fellow scholars) to understand the basis of facts and quotations the author uses to support the essay's argument and helps readers evaluate to what extent the argument is supported by evidence, and to evaluate the quality of that evidence. The academic essay tests the student's ability to present their thoughts in an organized way and is designed to test their intellectual capabilities.
Aristotle's writings were preserved by his student Theophrastus, his successor as leader of the Peripatetic School. Theophrastus' pupil Neleus and his heirs concealed the books in a vault to protect them from theft, but they were damaged by dampness, moths and worms. The books were found around 100 BC by Apellicon, who brought them to Rome. In Rome, scholars took interest in the works and prepared new editions of them. The writings of Aristotle that we have today are based on this collection. Overall, Aristotle wrote three types of works: dialogues or other works of a popular character, collections of scientific data and observations, and systematic treatises. His philosophy can be divided into four main areas: 1) Logic; 2) Theoretical Philosophy, including Metaphysics, Physics and Mathematics; 3) Practical Philosophy, such as Ethics and Politics; and 4) Poetical Philosophy, covering the study of poetry and the fine arts.