Edward L. Thorndike, in Chapter I of his Educational Psychology, Briefer Course, 1914, gives a general survey of the native factors in mental life and behavior. Hollingworth and Poffenberger, in their Applied Psychology, 1917, devote Chapters II and III to the matter of mental heredity. Norsworthy and Whitley, in their Psychology of Childhood, devote Chapters I and II to "original nature". C. B. Davenport, in his Heredity and Eugenics, presents evidence of the importance of heredity in determining mental and moral traits. Yerkes and Bloomfleld, in a short article in the Psychological Bulletin for 1910, Vol. 7, pp. 253-263, under the title, "Do Kittens Instinctively Kill Mice?", furnish a good illustration of the method employed in distinguishing native from acquired reactions. CHAPTER VI
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