While the 19th century put children in school, the first half of the 20th focused on those who didn't go. By examining the trajectory and work of Fernand Deligny (1913-1996), schoolteacher, educator and writer, this book aims to redraw this history. this philosophical investigation aims to better situate Deligny's place.

In hegelian french-speaking litterature, only partial studies about Iena's period are available. The present book attempts to consider the whole of hegelian thinking of this time, and to question its transformations, as well in the field of logic as in those of philosophy of nature or philosophy of spirit.

The book questions the representations, debates and arguments supported by the authors of the 17th century about the relationship between men and beasts, also called "brutes" at that time. No animal ethics appears in their writings, but this absence cannot be related to the mere expression of irrational prejudices.

The philosophy of life of Jean-Marie Guyau (1854-1888) represents one of the most original perspectives of his time in the fields of ethics, aesthetics and sociological studies. This book , aims to rediscover the relevance of his thought, by asking a fundamental question: who are Guyau's true contemporaries?