8 HEREDITY AND CHRISTIAN PROBLEMS 



but more especially resembles one of them. 

 Here, again, there are two forms: (i) When 

 the heredity takes place in the same sex; and 

 (2) when it occurs between different sexes, — 

 the more common form. 



(2) Reversional Heredity, Atavism, consists in 

 the reproduction in the descendants of the moral 

 or physical qualities of their ancestors. It occurs 

 frequently between grandfather and grandson, 

 grandmother and granddaughter. 



(3) Collateral, or Indirect Heredity, which is 

 of rarer occurrence than the foregoing, exists, 

 as indicated by its name, between individuals and 

 their ancestors in the indirect line, — uncle or 

 grand-uncle and nephew, aunt and niece. It is 

 another form of atavism, and occurs where there 

 is " ' representation of collaterals in the physical 

 and moral character of the progeny.' We often 

 observe," Ribot continues, "between distant rela- 

 tives . . . striking resemblances of conformation, 

 face, inclinations, passions, character, deformity, 

 and disease." ^ 



(4) Heredity of Influence, very rare from the 

 physiological point of view, and probably not 

 proved in any single instance in the moral order. 

 " It consists in the reproduction in the children 



'^Heredity, Ribot, pp, 170, 171. 



