Chapter II: Preface: iii

PART I. Build, its definition and its ontogeny 3

A. General considerations 3

Types of variation in build 4

The measurement of build 4

Ontogenetic 4

Adult 5

Sexual differences in build 5

Racial differences in build 7

Geographical differences in build 7

B. The ontogeny of build 8

Materials and methods 8

The ontogenetic curve of build 11

Later ontogenetic changes in individual build 16

Relation of juvenile to adult build 19

PART II. Mass studies in heredity of adult build 22

Methods and materials 23

The adult index of build 24

Classification of build 26

Significance of variations in build 28

Diseases in relation to build 29

Mass study of variation and heredity in build 36

Regression of progeny toward mediocrity 37

Hypothesis 40

Mate selection in build 44

The basal tables 46