According to Gabriel Delanne’s own words in the Introduction to this work, this book’s aim is to study the physical and psychic evolution of the incarnate Spirit, taking into account the logical teachings of Spiritism and the latest scientific discoveries. The author seeks to demonstrate that it is through an uninterrupted evolution, starting from the most rudimentary forms up to the human condition, that the thinking principle slowly gains its individuality, raising itself, over a series of reincarnations, to higher destinies. Students of the Spiritist Doctrine will find here a wealth of material about the extremely important connecting element between the body and the Spirit: the perispirit, whose reality Delanne endeavors to confirm. KnowSpiritism Books is a nonprofit, family-run publisher dedicated to sharing Spiritist works. Our mission is to disseminate Allan Kardec’s teachings by translating and publishing valuable content, making Spiritism more accessible to readers around the world. We invite you to explore our collection and discover the enlightening principles of this Christian doctrine.