This book is an English translation of Book 25 of the Astrologia Gallica, in which Morin explains how to make Mundane Predictions for a particular place by using Aries Ingresses and Lunations (along with their quarters) as the main tools. He discusses the common use of Solar and Lunar Eclipses for that purpose and concludes that they are of only minor importance and do not have the long-lasting effects usually attributed to them. He also discusses the possibility of drawing some conclusions from the Conjunctions of the outer Planets and even from Comets. Morin was a physician who became the most renowned of all French astrologers. He was appointed Royal Mathematician to King Louis XIII and was summoned to be present at the birth of the royal heir, the future King Louis XIV. The present volume contains Morin’s example charts of several Ingresses and one Eclipse as seen at Paris, France, in 1646, with a detailed explanation of his method of interpreting them. An added feature of this book is Jean Hieroz’s statement of Offusius’s rules for Planetary strength and Hieroz’s own account of his efforts to use Morin’s methods to predict the outbreak of World War II in 1939. Jean Hieroz (b.1 889) was a prominent French astrologer in the 1930s and 1940s. He had studied under Henri Selva, the French revival astrologer who had rescued J-B Morin’s Astrologia Gallica from obscurity and published the first translation of Book 21 of that work. James Herschel Holden is Research Director of the American Federation of Astrologers and has previously translated Books 13-17, 19, 22, 23, and 24 of the Astrologia Gallica.