Jacobs shows that this abundance of Jewish men of genius of the first order is allied with a deficiency in men of the second order of intellect. He explains the superiority by the higher level of education among the Jews, their devotion to family life, the almost complete absence of priests and dogmas, the facilities which the study of Hebrew offers for investigations in philosophy and for that kind of music which forms part of their religious ceremonies. It is difficult, however, to find a relationship between this rhythmical caterwauling and the sublime notes of Meyerbeer and Mendelssohn; and Jews possess more than enough of priests and dogmas. I would add that if the Jews have not yet produced men like Newton, Darwin, and Michelangelo, it is because they have not yet accomplished their ethnic evolution, as they show by the obstinacy with which they cling to their ancient beliefs. It is strange that among the factors of Jewish superiority in genius Jacobs does not mention the neurotic tendency, the existence of which, as we shall see, he has himself shown. This would also well explain the deficiency of Jews in intellect of medium quality in which the morbid element is always less marked. _Insanity._--It is curious to note that the Jewish elements in the population furnish four and even six times as many lunatics as the rest of the population. Jacobs, who, as we have seen, does not suspect the correlation between genius and insanity, gives a remarkable proof of it by pointing out that while Englishmen have 3,050 per million afflicted with mental disease, Scotchmen have 3,400, and Jews 3,900, the proportion of insanity in the three races being related to the proportion of genius. And while, according to Galton, there are 256,000 of the mediocre class among a million Englishmen, Jacobs reckons that there are only 239,000 among Scotchmen, and 222,000 among Jews. Servi found 1 lunatic to 391 Jews in Italy, nearly four times as many as among Catholics.[248] This fact has been made still clearer by Verga[249] who in 1870 found the proportions of lunatics among Catholics to be 1 in 1775, as against 1 in 384 among Jews. Mayr[250] (in 1871) gives the proportion of lunatics in Germany as follows:-- Per 10,000 Christians. Per 10,000 Jews. Prussia 8.7 14.1 Bavaria 9.8 25.2 All Germany 8.6 16.1