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(1941). Psychoanalytic Quarterly, 10:284-296

A Psychoanalytic Study of a Fraternal Twin

Douglass W. Orr

Introduction

Twins have been studied extensively, especially from two points of view: (1) twinning itself, including particularly the physiological and developmental phenomena of twins from conception to death; and (2) heredity versus environment, in which cases of identical twins separated very early in life and reared in widely different environments seem to offer crucial physiological and psychological data. The work of Rosanoff in this field is well known to psychiatrists. The monograph of Newman, Freeman, and Holzinger—a biologist, a psychologist, and a statistician—is representative of the literature on twins prior to 1937, and probably contains everything that biologists and academic psychologists can tell us about twins.

The deeper psychology of twins is still to be studied thoroughly. The psychoanalysis of twins should be of great theoretical value, adding to data already accumulated on the subject of sibling relationships and perhaps to a more

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