[62] "By the marriage with Elizabeth Farnese (ancestry normal), Philip V had, as an heir, Charles III, of Spain, who was the best of the more modern sovereigns of that country--in fact, the only normal one since before the days of the Emperor Charles V, now seven generations in the background. Not that Charles III inherited any of the ancient genius, for that had gone, never to appear again. He was, however, ([to cite] Hume), 'an enlightened, generous, and just king and a noble and magnanimous man,' and (Rose's Biographical Dictionary) 'possessed abilities as a monarch, and virtues as a private citizen, ... was a popular sovereign and a great economist of time, scrupulously methodical in all his operations.'" Thus writes Dr. F. A. Woods, in his Heredity in Royalty (New York, 1906), pp. 155, 156--a book which endeavors, on scientific lines, to ascertain the influence of heredity as displayed in the royal families of Europe. The chapter on the rulers of Spain is found at pp. 124-171. He says (p. 138): "The origin of the well-known insanity in the Spanish and Austrian houses, perpetuated over thirteen generations and involving more than a score of individuals, is a very interesting question. It cannot be traced with certainty prior to Isabella, the Queen of John II, of Castile. This Isabella was out and out insane, according to the English alienist, W. W. Ireland; and from her, onward, the insanity passed along in one form or another by the very intermarriages which their pride and political motives caused them to arrange, with the intended idea of making permanent their world power, but with the inevitable result of losing that same prestige by placing it in the hands of the unfortunate children whose inheritance was necessarily mental weakness as the result of such unwise wedlocks."