262 INBREEDING AND OUTBREEDING 



Jew and the English Jew are to-day scarcely more alike 

 than the Spaniard, the German or the Englishman ; but the 

 practical results of their religious beliefs, since they were 

 attained but partially, have been good in the genetic sense, 

 for a sufficient amount of inbreeding has prevailed to 

 bring out the possibilities inherent in the combinations 

 made. Civically this conventional isolation has worked to 

 the disadvantage both of the people themselves and of the 

 State in which they held citizenship, and at present it 

 would unquestionably be better from all points of view for 

 them to follow the advice of some of their broader minded 

 leaders in the United States and abandon it, since their 

 own variability has become so great as to make even a 

 theoretically fixed policy of intraracial marriage undesir- 

 able. An alliance of a Jew of high capacity and proved 

 worth with a "Nam" or a "Juke" of his own religion is 

 no more to be commended than a similar alliance among 

 those of other faiths. 



These three illustrations must suffice as anthropologi- 

 cal support of the point we have endeavored to emphasize. 

 In themselves they are not particularly convincing, it 

 must be admitted. Such data can never be used as critical 

 tests of biological theory. At the same time, when con- 

 sidered carefully in the light of the purely genetic facts 

 presented, it seems to us one must assent to the general 

 truth of the theses laid down. Man, like other organic 

 species, has varied markedly in hereditary characters. 

 Races have arisen which are as distinct in mental capacity 

 as in physical traits. These transmissible qualities are 

 governed by germinal factors and these factors are 

 passed on to succeeding generations by the same precise 

 laws that have been discussed in the proceeding pages. 



