In the book Le Bon claims that there are several characteristics of crowd psychology: "impulsiveness, irritability, incapacity to reason, the absence of judgement of the critical spirit, the exaggeration of sentiments, and others..." Le Bon claimed that "an individual immersed for some length of time in a crowd soon finds himself – either in consequence of magnetic influence given out by the crowd or from some other cause of which we are ignorant – in a special state, which much resembles the state of fascination in which the hypnotized individual finds himself in the hands of the hypnotizer."

An unabridged republication of a standard English translation [1896] of the work originally published in 1895 in France as La psychologie des foules. Includes bibliographical references and index. https://www.gutenberg.org/ebooks/445

Introduction: The Era of the Crowds. Book I: The Mind of Crowds -- Chapter I: General Characteristics of Crowds—Psychological Law of Their Mental Unity / Chapter II: The Sentiments and Morality of Crowds / Chapter III: The Ideas, Reasoning Power, and Imagination of Crowds / Chapter IV: A Religious Shape Assumed By All the Convictions of Crowds / Book II: The Opinions and Beliefs of Crowds -- Chapter I: Remote Factors of the Opinions and Beliefs of Crowds / Chapter II: The Immediate Factors of the Opinions of Crowds / Chapter III: The Leaders of Crowds and Their Means of Persuasion / Chapter IV: Limitations of the Variability of the Beliefs and Opinions of Crowds / Book III: The Classification and Description of the Different Kinds of Crowds -- Chapter I: The Classification of Crowds / Chapter II: Crowds Termed Criminal Crowds / Chapter III: Criminal Juries / Chapter IV: Electoral Crowds / Chapter V: Parliamentary Assemblies.