The Two Books of Apollonius Pergaeus is a mathematical treatise that focuses on tangencies, which has been restored by Franciscus Vieta and Marinus Ghetaldus. The book was originally written by Apollonius, a Greek mathematician, in the 3rd century BC. The restoration work was done in the 16th century, and this edition was published in 1771. The book contains detailed explanations of the principles of tangencies, along with diagrams and illustrations to help readers understand the concepts. It is considered an important work in the history of mathematics and has been studied by scholars and mathematicians for centuries.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.