The Works of John Playfair Volume 4 is a collection of writings by John Playfair, a Scottish mathematician and scientist who lived during the late 18th and early 19th centuries. This volume includes a memoir of the author, providing insights into his life and contributions to the fields of mathematics, astronomy, and geology.The book contains a range of Playfair's works, including his famous ""Illustrations of the Huttonian Theory of the Earth"", which presented a new understanding of the geological history of the planet. Other essays explore topics such as the nature of light and the principles of calculus.Throughout the book, Playfair's writing is marked by his clear and concise style, as well as his commitment to scientific rigor and accuracy. His works continue to be studied and appreciated by scholars and students of science and mathematics today.Overall, The Works of John Playfair Volume 4 is a valuable resource for anyone interested in the history of science and mathematics, as well as those looking to deepen their understanding of Playfair's important contributions to these fields.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.