vi CONTENTS. 



CHAPTER V. 



PAOE 



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. Special Data, 

 78. Measures at my Anthropometric Laboratory, 79. E^peri- 



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 ; 

 1), Mid-Parental, 99; c, Parental, 100; d, Fraternal, 108. 

 Squadron of Statures, 110. Successive Generations of a 

 People, 1 15. Natural Selection, 119. Variability in Frater- 

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

 Method, 127 ; Fourth 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 , .......... 128 



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

 Colour in the Population, 140. Fundamental Eye Colours, 

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



