8 



TUBERCULOSIS, HEREDITY 



band and wife. How many should we expect on 

 the basis of pure chance? Only three pairs [i.e. 



= 2-695]. There is clearly, there- 



55 



49 



1000 X 



1000 1000 



fore, a transfer of six individuals in all. On the scale of 



TUBERCULOSIS IN HUSBAND AND WIFE. 

 TABLE I. 



Actual : 



Pearson : Professional Classes. 

 Husband 



Wife 



Chance ; 



IVt/e 



NotT. 

 T. 



Totals 



NotT. 

 T. 



Totals 



Correlation 

 0-24 



Transfer 



+ 3 

 -3 



-3 



+ 3 



relationship the correlation is 024. Shall we argue that 

 to this extent the phthisical individuals infect their 

 mates ? It is better to investigate further before we do 

 more than note the fact that in the professional classes 

 there is a somewhat greater chance of the tuberculous 

 having a tuberculous mate. Dr. Goring has repeated a 

 similar investigation on the poorer classes, such as pro- 

 vide the bulk of our criminals. He has dealt first with 

 the well-to-do and prosperous of the poorer classes, as 

 shown in Table H. The transfer here is curiously 

 enough exactly the same, but since the percentage of 

 the tuberculous has risen the result is not so close. 



