Inheritance of Human Characters 139 



great line, the house of Brunswick, the son of 

 this mating was Peter II, of unstable mind, 

 while the daughter Natalia was as sweet as she 

 was energetic. 



Isabella and Ferdinand were both de- 

 scendants from lines of very great individuals, 

 although in each case there is insanity in the 

 family. Isabella herself comes from an insane 

 mother and an imbecile father, but her grand- 

 parents and great-grandparents were well- 

 balanced and able. The data for the charts of 

 these royal famihes were taken largely from 

 F. A. Wood's Mental and Moral Heredity in 

 Royalty, supplemented with information from 

 other sources. He grades the individuals on a 

 scale of 10. Ten represents very high ability, 

 as determined by the comparative amount of 

 space and laudation given to the individual in 

 such standard works as Lippincott's Biographi- 

 cal Dictionary. Five out of eight of Isabella's 

 great-grandparents rank very high. John the 

 Great of Portugal, twice her great-grandfather, 

 has a grade of 10. John of Gault, twice her 

 great-grandfather, has a grade of 8, as does also 



