First edition. Aimé Witz (1848-1926) was a professor at the Catholic Faculty of Sciences in Lille, known for his work in physics and chemistry, as well as for his interest in the history of science and popularization. This work is an anthology of eulogies delivered before the Academy of Sciences, offering an overview of the history of science through the key figures who have shaped it. Witz's preface and notes enrich this collection, which highlights the art of oratory and the way scientists were honored and presented to their peers and the public.