172 THE MENDEL JOURNAL 



Chart indicating the Family Incidence of Lenticular 



Cataract. 



The square symbols indicate males, and round 

 symbols females. 



Where there are numbers but no symbols it means 

 that the sex of the individuals indicated was not 

 ascertained. 



The solid black symbols indicate the affected persons. 



N within the symbols indicates normality of the 

 individual so far as cataract is concerned. Without a 

 symbol it means that, as far as I could ascertain, none of 

 the persons indicated had suffered from bhndness in any 

 form. In many of these cases I merely ascertained their 

 number but did not obtain other details, such as their sex. 



When no letter is within the open symbol it means 

 that no definite information as to presence or absence 

 of cataract was forthcoming. 



The numbers to the top left corner of each symbol 

 indicate the relative ages of the individuals and also 

 serve as the reference number. Among the affected, 

 Nos. 14 and 21 in the B generation, and Nos. 15 and 25 

 in the C generation, were personally examined by me 

 and their condition accuratel}" diagnosed. Among the 

 unaffected I similarl}^ examined the following : In the 

 C generation, Nos. 16, 17, 22, 23, and 26. In the D 

 generation, Nos. 1 and 18. Others were seen at various 

 times and either refused to allow their eyes being 

 examined or else no suitable opportunity for so doing 

 presented itself. 



P.E. beneath the S3^mbol means that I personally 

 examined the eyes of that individual. 



a d = Addison's disease (died of). 



C a = Cancer of breast, recurring later in dorsal 

 vertebrae. 



