The Principles of Psychology (Complete Edition in 2 Volumes) is William James's 1890 synthesis of mind and behavior, marrying introspective acuity to physiological and experimental findings. In lucid, essayistic prose, James names the 'stream of consciousness,' elaborates attention, habit, and ideomotor action, distinguishes the material, social, and spiritual selves, and defends the James-Lange account of emotion. He contests associationist atomism and soul-substance metaphysics, preferring a functional, pluralistic psychology attuned to use and context. The two volumes range from sensation and memory to will and belief, interlacing case reports, thought experiments, and laboratory results. James-a Harvard professor trained in medicine-absorbed German experimentalism and British empiricism while resisting reductive mechanism; Darwin's biology and Renouvier's voluntarism shaped his account of habit and will. His melancholy, pedagogy, and early demonstrations at Harvard pressed him toward a humane, anti-dogmatic stance that later blossomed into pragmatism and radical empiricism. Scholars of psychology, philosophy of mind, and literary modernism will find this complete edition indispensable: historically pivotal, methodologically adventurous, and still startlingly prescient on attention, habit, and the self. Read it to encounter a foundational mind at full stretch, and to test contemporary theories against an unfailingly lucid, generous, and rigorous precursor. Quickie Classics summarizes timeless works with precision, preserving the author's voice and keeping the prose clear, fast, and readable-distilled, never diluted. Enriched Edition extras: Introduction · Synopsis · Historical Context · Author Biography · Brief Analysis · 4 Reflection Q&As · Editorial Footnotes.