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The author would define instinct as behaviour 'forms' controlled by an inner compulsion. He suggests a classification based on three psychological characters: (1) relative specificity, (2) appetition and reaction, (3) relation to emotion. A brief discussion of these characteristics leads to the following classification: (1) general and specific, (2) under each head, into appetitive and reactive, (3) under the last head into simple and emotional. This classification embodies many of the distinctions proposed by other psychologists.