MEASURE OF RESEMBLANCE OF FIRST COUSINS 



First Female Cousin 



I 



L9 



instead of the actual 



First Female Cousin 



The fourfold table method gives the correlation of the first table about - 33 and that 

 of the second "03. Now it is not suggested that four additional cases of insanity are 

 what we have to expect in the case of 124 persons chiefly young adults of insane 

 stock. What we wish to point out is that with a disease so relatively rare as this, 

 the transference when the record is completed of comparatively few individuals from 

 the sane to the insane category is sufficient to raise the intensity of resemblance to a 

 value quite equal to that which we have found for other characters in cousins. 



The following are the results reached for insanity and tuberculosis : 



Table VII. Inheritance of Pathological Condition in Cousins with 



incomplete Record. 



In all six series — and they number in each case about 3000 pairs — we have a 

 positive relationship, and the value is definitely significant in all cases but possibly 

 that of insanity in female cousins. Yet this, owing to the fact that a considerable 

 amount of insanity in the case of women is connected with change of life, is precisely 

 what we might have anticipated considering the ages of our cousins. The fact also 

 that insanity has a later average incidence than tuberculosis may explain why the 

 average value for tuberculosis is higlier than for insanity. We should conclude that 

 so far as our data go they show that the tendency to both insanity and tuberculosis 

 runs in stocks, and that with the incompleteness of the record there is no reason to 



