vi
CONTENTS.
CHAPTER V.
FAOï
Normal Variability..................... 51
Scheme of Déviations, 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.—Special Data,
78.—Measures at my Anthropometric Laboratory, 79.—Experi¬
ments in Sweet Peas, 79.
CHAPTER VII.
Discussion of thé 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 Frater¬
nities : First Method, 124 ; Second Method, 127 ; Third
Method, 127 ; Fouitli Method, 128 ; Trustworthiness of the
Constants, 130 ; General view of Kinship, 132.—Separate Con¬
tribution 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.