Vlll CONTENTS. 



PAGE 



Correlation 73 



General 73 



Man 73 



Lower animals 76 



Plants 78 



Heredity 78 



General 78 



Parental 79 



Grandparental 80 



Fraternal 80 



Theoretical coefficient of heredity between relatives 81 



Homotyposis 81 



Mendelism 82 



Telegony 82 



Fertility 82 



Selection 82 



Dissymmetry 82 



Direct effect of environment 83 



Local races 83 



Useful tables 84 



BIBLIOGRAPHY 85 



EXPLANATION OF TABLES 105 



LIST OF TABLES. 



The Greek alphabet 114 



Index to the principal letters used in the formulae of this book. . . 115 



Table I. Formulas 116 



II. Certain constants and their logarithms 117 



** III. Table of ordinates of normal curve, or values of 



2/o 



corresponding to values of -. 118 



o 



" IV. Table of half-class index values (a) or the values 

 of the normal probability integral corresponding to 



values of : or the fraction of the area of the curve 

 a 



between the limits and -\ or and 119 



a >a 



V. Table of Log r functions of p 126 



VI. Tat>le of reduction of linear dimensions* from common 



to metric system 128 



'* VII. Minutes and seconds in decimals of a degree 128 



*' VIII. First to sixth powers of integers from 1 to 30 129 



' ' IX. Probable errors of the coefficient of correlation 130 



" X. Squares, cubes, square-roots, cube-roots, and recip- 

 rocals , 131 



" XI. Logarithms of numbers 148 



** XII. Logarithmic sines, cosines, tangents, and cotangents. 175 



