vi CONTENTS. CHAPTER V.

PAGE

NORMAL VARIABILITY 51

Scheme of Deviations, 51.-Normal Curve of Distributions, 54.Comparison of the Observed with the Normal Curve, 56: -The value of a single Deviation at a known Grade, determines a Normal Scheme of Deviations, 60.-Two Measures at known Grades, determine a Normal Scheme of Measures, 61. The Charms of Statistics, 62.-Mechanical Illustration of the Cause of Curve of Frequency, 63.-Order in Apparent Chaos, 66.-Problems in the Law of Error, 66.

CHAPTER VI.

DATA 71

Records of Family Faculties, or R.F,F. data, 72.-Speci•il Data, 78.-Measures at my Anthropometric Laboratory, 79. -Experiments in Sweet Peas, 79.

CHAPTER VII.

DiscussION OF THE DATA OF STATURE 83

Stature as a Subject for Inquiry, 83.-Marriage Selection, 85.Issue of Unlike Parents, 88.-Description of the Tables of Stature, 91.-Mid-Stature of the Population, 92.-Variability of the Population, 93.-Variability of Mid-Parents, 93.Variability in Co-Fraternities, 94.-Regression,-a, Filial, 95; b, Mid-Parental, 99; c, Parental, 100 ; d, Fraternal, 108.Squadron of Statures, 110.-Successive Generations of a People, 115.-Natural Selection, 119.-Variability in Fraternities : First Method, 124 ; Second Method, 127 ; Third Method, 127; Fouith Method, 128 ; Trustworthiness of the Constants, 130 ; General view of Kinship, 132.-Separate Contribution of each Ancestor, 134.-Pedigree Moths, 136.

CHAPTER VIII.

DISCUSSION OF THE DATA OF EYE COLOUR 138

Preliminary Remarks, 138.-Data, 139.-Persistence of Eye Colour in the Population, 140.-Fundamental Eye Colours, 142.-Principles of Calculation, 148.-Results, 152.