Constitutional Theories: Body Types and Endocrine (UGC-NET Unit III)

Ernst Kretschmer set out the first influential constitutional typology in Physique and Character (1921), working from clinical observation of psychiatric patients. He proposed four physical builds: the pyknic type (rounded, thickset), the leptosomic or asthenic type (narrow, slight), the athletic type (broad-shouldered, muscular), and a residual dysplastic type for builds that fit none of the other three.

For NET recall, keep the pairing straight: Kretschmer linked the pyknic build to a cyclothymic temperament, prone to mood swings between elation and depression, and linked the leptosomic and athletic builds to a schizothymic temperament, withdrawn and sensitive.

Kretschmer's own interest was psychiatric rather than criminological; later criminologists extended his temperament pairing to offending patterns, but the extension rested on clinical impression rather than a matched offender comparison of the kind Charles Goring had already shown was necessary against Lombroso's atavistic theory of the born criminal.

William Sheldon replaced Kretschmer's discrete types with a continuous rating system in Varieties of Human Physique (1940): endomorphy (soft, rounded), mesomorphy (muscular), and ectomorphy (lean, fragile), each scored on a seven-point scale, paired respectively with the temperaments viscerotonia, somatotonia, and cerebrotonia.

In Varieties of Delinquent Youth (1949), Sheldon somatotyped 200 young men at a Boston rehabilitation home and reported a skew toward mesomorphy, but the study used no matched non-delinquent control group and Sheldon rated both physique and delinquency status himself.

Sheldon and Eleanor Glueck supplied the controlled test Sheldon's own study lacked. Using their matched sample of 500 delinquent and 500 non-delinquent boys from Unraveling Juvenile Delinquency, their 1956 book Physique and Delinquency confirmed mesomorphy was overrepresented among delinquents, roughly 60 percent against about 30 percent in the control group.

For NET, the exact point to remember is what the Gluecks' own data also showed: family cohesion and supervision predicted delinquency independently of build, which rules out reading the mesomorphy correlation as a single biological cause.

A separate constitutional argument tried to show criminality itself passed down family lines. Richard Dugdale's The Jukes: A Study in Crime, Pauperism, Disease and Heredity (1877) traced roughly 700 descendants of one New York family and reported disproportionate crime, pauperism, and disease across generations, though Dugdale himself weighed environment alongside heredity.

Henry Goddard's The Kallikak Family: A Study in the Heredity of Feeble-Mindedness (1912) made the argument more starkly, comparing two lines descended from one man: a line founded with a woman Goddard called feebleminded, which he claimed produced generations of paupers and criminals, against a respectable line from the same ancestor.

Both studies collapsed under later scrutiny for the same reason: neither could separate an inherited trait from inherited poverty and stigma passed down the same family line. A 1985 re-examination of Goddard's field records found many case histories were vague, second-hand, or shaped by the field workers' own assumptions.

Max Schlapp and Edward Smith set out the endocrine argument in The New Criminology (1928), proposing that malfunctioning glands such as the thyroid, adrenal, and pituitary disrupted the hormonal balance that ordinarily keeps emotion and impulse under control, producing conduct such as assault or crimes that seemed to lack rational motive.

The theory drew brief institutional interest in American prisons in the late 1920s and 1930s but faded once basic endocrinology matured and no controlled comparison reproduced the claimed gland-to-crime pathway.

William Healy and Augusta Bronner, working at the Judge Baker Foundation, rejected any single-cause account of delinquency in New Light on Delinquency and Its Treatment (1936), arguing each case had to be investigated across biological, psychological, family, and social dimensions together.

In Britain, Cyril Burt reached a parallel conclusion in The Young Delinquent (1925), tabulating many contributing factors, none sufficient alone. Multiple-factor theory functions as a research method rather than a single causal theory, and it is the bridge from constitutional theory to modern integrated criminology.