34 THE KALLIKAK FAMILY 



EXPLANATION OF SYMBOLS 



Individuals are represented by squares and circles, 

 the squares being males, the circles, females. Black 

 squares and circles (with a white "F") mean feeble- 

 minded individuals ; N means normal persons. 



The clear squares or circles indicate that the mentality 

 of the person is undetermined. 



"d. inf." means died in infancy. 



A horizontal or slightly oblique line connects persons 

 who are mated. Unless otherwise indicated, they are 

 supposed to have been legally married. 



The symbols dependent from the same horizontal 

 line are for brothers and sisters. 



A vertical line connecting this horizontal line with 

 an individual or with a line connecting two individuals, 

 indicates the parent or parents of the fraternity. 



Letters placed around the symbol for an individual 

 are as follows : A Alcoholic, meaning decidedly in- 

 temperate, a drunkard; B Blind; C Criminalistic ; 

 D Deaf; E Epileptic ; I-- Insane; Sy Syphilitic; 

 Sx Sexually immoral ; T- -Tuberculous. 



A short vertical line dependent from the horizontal 

 fraternity line indicates a child whose sex is unknown. 

 An F at the end of the line indicates that such child 

 was feeble-minded. 



