Thomists have have traditionally presented philosophy and theology in St. Thomas Aquinas' own native scholastic methodology. This methodology allowed philosophical and theological disciplines to advance objectively and in a scientific manner for centuries-understanding 'science' in the Aristotelian sense. Hugon's multi-volume work uses this methodology, offering formal arguments with clearly identifiable premises and conclusions and formal objections with clearly identifiable distinctions, etc., covering practically all the parts of speculative philosophy. The manual is a true work of synthesis of seven centuries of Thomistic tradition. This translation thus puts into print and at the reach of English speakers an introduction to Thomistic philosophy that follows the scholastic scientific methodology faithfully, thus providing them with a solid means of learning the all-but-forgotten art of scholastic disputation. This Cosmology volume covers the first part of natural philosophy, consid