The book "Lectures and Essays" by Thomas Henry Huxley is a collection of works by an outstanding English scientist, biologist, popularizer of science and publicist. This book is a collection of lectures and essays where the author examines various aspects of natural sciences, philosophy, religion and society. Thomas Henry Huxley skillfully combines science and humanism, and his works help the reader to better understand the world around him. The book "Lectures and Essays" remains relevant and intellectually meaningful regardless of the time of publication, because it reflects the key moments and thoughts of the scientist, which open new horizons of understanding the world.