“…Order of birth and its consequents have been of interest intermittently to psychologists for almost a century, and perhaps longer (e.g., Galton, 1874). During that period, it has been examined in relation to prominence, intelligence, delinquency, and physical and mental illness (Chen & Cobb, 1960;Ellis, 1904;Jones, 1931;Rosenow & Whyte, 1931;Sletto, 1934;Thurstone & Jenkins, 1929). Recently, Schachter (1959) focused attention on birth order as a determinant of social affiliation or withdrawal and such related phenomena as college attendance, alcoholism, and schizophrenia.…”