The study of psychology is constantly throwing fresh light upon the working of the human mind. By its experimental and comparative methods it has revolutionized the line of approach to the questions with which it deals; and its devotees are quite right in asserting that no study of human thought, conduct, or training can be wisely undertaken without some familiarity with the principles it has evolved. Beginning with the simpler processes, closely related to the purely physiological reflex actions, psychology has sought, like all other branches of learning that deal with man, to extend its province over his whole nature and connections. It explains how and why he feels and thinks, the sources of his emotions and convictions, and of his actions and inhibitions. Among the more recent fields it has explored is that of social life, and under the name of social psychology it strives to explain in a scientific way the relations of men with one another; the behavior first of mobs and crowds . . .
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