His work on crowd psychology became important during the first half of the twentieth century when it was used by media researchers such as Hadley Cantril and Herbert Blumer to describe the reactions of subordinate groups to media.
He also contributed to controversy about the nature of matter and energy. His book The Evolution of Matter was very popular in France (having twelve editions), and though some of its ideas—notably that all matter was inherently unstable and was constantly and...
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