“…There is a nearly unanimous tendency on the part of all students to trace these difficulties in large part to motivation, emotional instability, and faulty mental hygiene (3,5,8,9,31,39,61,68,74,80,83,104). Poor home environment, improper discipline and training are responsible in large measure (3,5,6,7,9,15,38,39,65,91), but poverty, nativity of parents, and size of family are not important according to Burt (9), Healy (39), Stuart (94), and Goodenough (32). Burt (9), and Healy (39) go so far as to deny the importance of family history of mental deficiency or instability.…”