Apollonii Pergaei Locorum Planorum Libri II, restituti a Roberto Simson, is a meticulously reconstructed edition of Apollonius of Perga's work on plane loci. This Latin edition, edited by Robert Simson, offers invaluable insights into the geometrical methods of the ancient Greeks. The text presents a detailed exploration of plane loci, crucial to understanding the development of geometry and its applications.