"Ontology, or the Theory of Being" by Peter Coffey is a scholarly work on metaphysics written in the early 20th century. This treatise aims to provide an English-language textbook on general metaphysics from a scholastic perspective, emphasizing the relevance of medieval discussions to contemporary philosophical inquiries. The book covers fundamental concepts related to being, existence, essence, and the nature of reality, seeking to bridge the insights of historical philosophers with modern thought. The opening of the text presents a preface that articulates the author's intent in creating this work, specifically to address a perceived gap in philosophical education regarding the subject of ontology. Coffey discusses the historical context of various philosophical debates, asserting that many medieval scholastic theories remain pertinent and are still debated within modern philosophical circles. He establishes that the text will not delve into epistemology, as he plans to address that subject in a subsequent volume. This introductory section sets the stage for a comprehensive exploration of the nature of being, its primary determinations, and the relationship between being and knowledge, positioning the work as a foundational resource for philosophy students and enthusiasts alike. (This is an automatically generated summary.)