A startling rediscovery of how life answers the world: Irritability exposes the hidden language by which organisms react, adapt and survive. In this landmark Max Verworn book, the author offers a rigorous yet lyrical physiological analysis of the general effect of stimuli in living substance. Combining empirical observation with thoughtful explanation, Verworn maps the physiological response of cells and organisms to biological stimuli effects from the simplest twitch to complex adaptive behavior. Readers will find a systematic, accessible study of irritability: how living organisms response to stimuli, the stimuli impact on biology, and the broader implications for physiology and medicine. This edition restores a pivotal academic study on irritability that has been out of print for decades and is now republished by Alpha Editions. Carefully remastered and annotated, the text preserves Verworn s original voice while clarifying terminology for modern readers. It s not merely a reprint; it s a collector s item and cultural treasure reintroduced for today s scholars, clinicians, and curious minds. Whether you re a student of physiological research, a historian of science, or a collector of rare scientific works, this volume bridges past and present offering both foundational insight and renewed relevance. Essential reading for anyone intrigued by the scientific exploration of irritability, the effect of stimuli on living substance, and the enduring mystery of life s responses.