Dr. Woods, of Harvard, has in this interesting series of papers made a careful study of an old problem—the heredity of mental and moral characters, including insanity, in royal families. He deals with all the chief royal families of modem Europe in succession, using the copious material contained in Lehr's Genealogy and applying to it some of the methods of Galton. His main general conclusion emphasises the influence of heredity as against environment. On the intellectual side he considers that heredity accounts for nearly nine tenths of the phenomena, on the moral side for rather more than one half. Variations in the offspring are found associated with corresponding variations in the ancestry, so that when good and bad blood is mixed the children tend to show corresponding deviations in both directions, although they may be all bred in the same environment. There is found to be a slight, but only a slight, relationship between genius and insanity.
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