12 



TUBERCULOSIS, HEREDITY 



find one of 102 (see Table VI), and the correlation has 

 risen to the high value of 0-70 ! In other words, the 

 infection of tuberculosis between husband and wife is of 

 a wholly different order to the infection of alcohol ! But 

 if the 0-25 resemblance of husband and wife in the 

 case of tuberculosis is to be attributed to infection, 

 what shall we say of the 0'25 in the case of insanity ? 



TABLE V. INSANITY. 



Pearson : Professional Classes. 



victual : Husband 



Correlation 

 024 



ii7-f ^ Not I. 



Totals 



Chance : 



„... , Not I. 

 IVt/e ] J 



Totals 



Transfer 



+ 1 

 -7 



-7 



+ 7 



Can we not account for both on a like basis ? It has 

 been found impossible at present to define the constitu- 

 tion peculiarly liable to tuberculosis. Galton attempted 

 it with composite portraits of the tuberculous, but it is 

 difficult to describe verbally the facial differentiation, if 

 any, of this composite. 



Yet there are several mental characters of the 

 phthisical which will be familiar to some of my audience, 

 notably in many cases a certain strenuousness and 

 keenness. It is conceivable that phthisical stocks are 

 to a certain extent sympathetic to each other, and that 



