2 74 HEREDITY AND DISEASE 



As Mr. Bateson points out, such descent of the condition through 

 the unaffected is exceptional. The capitals indicate affected 

 persons. 



/? 



f? 



I I I I I 



M M F F 4/ 



I I I I I I 

 3z« M F F M »? 



F M M F / 



F F MM 2w / m 



lO F 7n ni Y ni f f F m m 



The second pedigree is also very interesting. The capital 

 letters M and F and the Roman numerals indicate affected 

 persons ; the small letters and the small numbers indicate un- 

 affected persons ; the circles indicate unaffected persons undeter- 

 mined. 



M X / 



Alcoholism. — There is practical unanimity among physicians 

 that the abuse of alcohol is prejudicial to the race as well as 

 to the individual, but there is considerable difference of opinion 

 as to the theoretical interpretation of the observed facts. As the 



