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.— Specid Data, 

 78. — Measures at my Anthropometric Laboratory, 79. — Experi- 

 ments in Sweet Peas, 79. 



CHAPTER VII. 



Discussion op 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 Frater- 

 nities : First Method, 124 ; Second Method, 127 ; Third 

 Method, 127; Fouith Method, 128; Trustworthiness of the 

 Constants, 130 ; General view of Kinship, 132.— Separate Con- 

 tribution of each Ancestor, 13±. — Pedigree Moths, 136. 



CHAPTER VIII. 

 Discussion of the Data of Eye Colour , i:-s 



Preliminary Remarks, 138.— Data, 139.— Persistence of Eye 

 Colour in the Population, 140.— Fundamental Eye Colours, 

 142.— Principles of Calculation, 148.— Results, 152. 



