About This Book
The book surveys human mental and physical variation through careful observation, measurement, and statistical analysis, describing methods such as anthropometry, composite portraiture, sensory and psychometric testing, fingerprint classification, and twin studies. It explores the roles of heredity and environment in shaping abilities and character, presents apparatus and case collections, and considers social implications including proposals associated with eugenics. Extended essays examine mental imagery, physiognomy, and practical laboratory procedures, combining illustrative plates with methodological critique to advocate a systematic, empirical approach to studying human faculties and their development.
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