D. F. Weeks.Biology and Eugenics.65 
doubt that several others are related. These relationships may in time be 
established by the field workers. 
In the detailed study in the seven tables which follow, 31 of the histories 
were not considered because there seemed to be too much doubt as to the 
exact mental status of one or both of the parents. In addition, however, 
to the 357 principal matings considered, 83 secondary matings were used, 
making the total number of fraternities studied 440. 
The total number of epileptics recorded on the charts was 756, which 
was 3% of the total chart population of 21,558, or 9% of the 8,698 
classified individuals. The 397 patients studied ranked in line of birth 
from one to nineteen; 236, or nearly 60%, ranked before fourth in line of 
birth. (Table X.) Only 30% came from bad surroundings and poverty- 
stricken homes where they had no proper care, which would seem to confirm 
the theory that epilepsy is inherited and not due to environment. 
In analyzing our data, we have classified it under the six kinds of matings, 
as follows :—Nulliplex x Nulliplex. 
There are 27 fraternities in which both parents are either epileptic or 
feeble-minded. Sixteen of these matings are principal matings and 11 
secondary matings. (Table I.) 
In three of the matings both of the parents were epileptic. Of the 28 
conceptions, two were still-births, three miscarriages, three died before two 
years of age, and one (an infant) is too young for classification, leaving 
19 about whom something definite is known. Of these, eight were epileptic, 
three feeble-minded, and eight, who came from parents who developed 
epilepsy late in life, were tainted. (Fig. 1.) 
Case 3667. 
Fig. 1.—The principal mating in this case is of two epileptics, who had 
four children, three of whom are epileptic, and one feeble-minded. Since 
the death of the father the mother has married an alcoholic man, and has 
had one child. E, epileptic; F, feeble-minded; A, alcoholic; N, normal; 
d, died; b. born.F