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 intemperate, 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.