Physiology: The Science of the Body

This early 20th-century work offers a window into how scientists once understood the living body as a grand machinery of interconnected systems. Martin begins not with anatomy, but with a deceptively simple question: what makes something alive? His answer unfolds through elegant observations about motion, response, and growth, ultimately arriving at the cellular world of protoplasm the building blocks he believed held the secret to all physiological function. The book moves from these foundational questions to practical concerns: how the body maintains itself, where sustenance comes from, and how food becomes energy. What elevates this beyond a simple textbook is Martin's thought experiment about alien observers encountering human machines would they mistake them for living things? This playful speculation reveals a scientist genuinely wrestling with biology's deepest questions. Though some science has naturally aged, the book's clarity and systematic approach to explaining the body's maintenance of life remains impressive. Ideal for readers curious about the history of science or anyone who wants to understand how our grandparents learned about their own bodies.