First Notions of Logic: Preparatory to the Study of Geometry is a book written by Augustus De Morgan in 1840. The book is a comprehensive introduction to logic, designed to prepare students for the study of geometry. De Morgan was a British mathematician, logician, and philosopher, and his work in this book reflects his expertise in these fields. The book begins by introducing the basic concepts of logic, such as propositions, terms, and syllogisms. De Morgan then moves on to more advanced topics, such as the laws of thought, the theory of inference, and the principles of induction and deduction. The book also covers the history of logic, including the contributions of Aristotle, Bacon, and other philosophers. Throughout the book, De Morgan uses clear and concise language to explain complex concepts, making it accessible to readers of all levels. He also includes numerous examples and exercises to help readers apply the concepts they have learned. Overall, First Notions of Logic: Preparatory to the Study of Geometry is an essential book for anyone interested in the study of logic, mathematics, or philosophy. It provides a solid foundation for further study in these fields and remains a valuable resource for students and scholars alike.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.