Instinct, human action largely governed by, [44-54;]
stress placed on, as motive power of life, [81-83.]
Intelligence tests, use of, [185-186.]
Intolerance, a persisting source of evil, [228-229.]
Isolation of the subnormal, [233-249.]
Jealousy, crime traceable to, [84-85.]
Jesus, doctrine of vengeance repudiated by, [13-14.]
Judges, attitude of, [282-283.]
Jukes family, study of the, [244-248;]
wrong deductions from, [248-249.]