On Generation and Corruption is a scientific work written by Aristotle in which he explores the concepts of change, decay, and permanence in the natural world. The book is divided into two main sections: the first deals with the nature of change and motion, while the second focuses on the concept of generation and corruption. Aristotle argues that everything in the natural world is subject to change, and that this change can be either accidental or substantial. Accidental change refers to changes in the properties or characteristics of an object, while substantial change refers to a change in the object's very essence or being. He also argues that change can only occur through motion, which is the transfer of potentiality to actuality. Read in English, unabridged.