122 THE PEBBLY INHIBITED. 



spring of a manic parent, all are excitable except 6 "normals." When 

 neither parent is excitable, none of the children are excitable; when 

 neither parent shows depression the children rarely do; when one 

 parent shows melanchoUa and the other carries no depression, none of 

 the children suffer from melancholia (p. 90). 



(3) None of the other three hypotheses that may be applied to the 

 facts of family distribution of temperaments works nearly so satis- 

 factorily as the hypothesis suggested (pp. 91-92). 



(4) In manic-depressive insanity the manic and the depressed tend- 

 encies are inherited differently. This corollary of "the h)T)othesis" 

 serves to harmonize the different views as to the inheritance of func- 

 tional insanity. Also, there is much evidence from the literature that 

 this distinction has been dimly seen (pp. 95-99). 



(5) The evidence of similarity of temperament of "identical twins" 

 supports the view of the specific inheritableness of the type of tem- 

 perament (pp. 100-105). 



In marriage selection it is quite certain that unconscious temperament 

 plays an important part. Thus the mated pair rarely have the same 

 zygotic temperamental formula. Two choleric or nervous persons 

 preferably do not marry each other. Two melancholies rarely inter- 

 marry. There is, in marriage, a selection against similar tempera- 

 ments and a preference for those of more or less markedly dissimilar 

 temperaments (pp. 106-108). 



In suicides the same two t)rpes of the hyperkinetic and the hypo- 

 kinetic can be distinguished (pp. 108-115). 



A family tendency to suicide by the same method is evident; but 

 it is uncertain whether this is due chiefly to subconscious suggestion or 

 to an hereditary bias (pp. 11 6-1 18). 



The fvmctional insanities are regarded as syndromes whose elements 

 are separately inheritable (pp. 11 8-1 19). 



Just what we shall do, in any situation, is determined by numerous 

 factors; but the general nature of our reactions, whether violent 

 or repressed — this is determined by the hereditary nature of our 

 temperaments (pp. 1 20-1 21). 



The romantic and the classic t)rpes, the hyperkinetic and the hypo- 

 kinetic, the radical and the conservative, the feebly-inhibited and the 

 strongly-inhibited, constitute a dualism that runs through our whole 

 population (p. 120). 



