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"",...