One line of descent exhibited no pronounced whirling tendency; the other exhibited a strong tendency to whirl to the left. Are these statements true for the group of one hundred individuals whose distribution among the three classes of whirlers has been given? In order to obtain an answer to this question I have reclassified these individuals according to descent and direction of whirling.
INDIVIDUALS OF THE 200 LINE
RIGHT WHIRLERS LEFT WHIRLERS MIXED WHIRLERS TOTAL
Males 7 6 8 21 Females 5 8 8 21 12 14 16 42
INDIVIDUALS OF THE 400 LINE
RIGHT WHIRLERS LEFT WHIRLERS MIXED WHIRLERS TOTAL
Males 4 9 1 14 Females 6 9 4 19 10 18 5 33
INDIVIDUALS OF MIXED DESCENT
9 10 6 25
Three interesting facts are indicated by these results: first, the inheritance of a tendency to whirl to the left in the 400 line of descent; second, the lack of any definite whirling tendency in the 200 line; and third, the occurrence of right and left whirlers with equal frequency as a result of the crossing of these two lines of descent.