This book is a collection of public lectures and speeches delivered by Thomas Henry Huxley to American audiences. The majority of the topics covered are related to evolutionary biology, while one lecture was specifically given for the opening of John Hopkins University. Huxley was a prominent advocate for the theory of evolution and his speeches reflect his passion for scientific inquiry and the importance of evidence-based reasoning. The book provides insight into Huxley's ideas and his engagement with American audiences, as well as his influence on the development of evolutionary thought.