ILLUSTRATIONS TO VOLUME III A

Frontispiece. Francis Galton, aged 66, from the copperplate prepared for Biometrika, Vol. 11.

Extra Plate. The Greek Girl of the "Just Perceptible Difference" Lecture of 1893, to face Table of Contents.

Tailpiece.   Sir William J. Herschel's Forefinger prints at an interval of 54 years,

the longest known evidence for persistence, to face Appendix ii, p. 438.
PLATE   to face page

I.   The Genometer. after a suggestion of Francis Galton .   30

II.   Galton's "Ogive Curve" as exhibited by a marshalled series of

Bean Pods   31

III.   Dr Sorby's painting of a tree from the black pigment of human hair   97

IV.   Dr Sorby's painting of a tree from the red pigment of human hair   97

V.   Rajyadhar Konai's Contract with Sir W. J. Herschel, made at Hooghly,

1858, and signed with the imprint of his right hand .   146

VI.   Effects of various injuries on Finger-Print Patterns   154

VII.   Persistence of minutiae in Finger-Print Patterns at intervals of nine

and twenty-eight years   166 VIII. Persistence of minutiae in Finger-Print Patterns at intervals of twenty

six, thirty and thirty-one years .   166

IX.   The Standard Patterns of Purkenje, with Galton's drawings of their

Cores   179

X.   Examples of the "outlining" of Patterns to assist Classification .   180

XI. Outlines of Patterns in Arches and Loops . 181 XII. Outlines of Patterns in Whorls, and Cores to Loop• s and Whorls . 181 XIII. Outlines of the ten Digits of eight Persons, taken at random 181 XIV. Transitional Patterns-Arches and Loops .   181

XV. Transitional Patterns-Loops and Whorls . 181 XVI. Persistence of Finger-Prints, Enlarged Patterns . 182 XVII. Persistence of Finger-Print Patterns with corresponding minutiae like

numbered 182 XXIII. Finger-Prints of Like Twins, from • the Collection in the Galtoniana 191 XIX.   Blurred Finger-Prints, Illustrations of Galton's Treatment (enlarged

21- times) 197 XX. Selected corresponding Portions of Blurred Doublets (enlarged 7 times) 197 XXI. Skeleton Charts of Ridge Central Lines of Doublets of Plate XX 197 XXII. Plate XXI overprinted on Plate XX . 197 XXIII. Classification of Finger-Prints, Types treated by Galton as Arches 213 XXIV. Classification of Finger-Prints, Types treated by Galton as Loops . 213 XX V. Classification of Finger-Prints, Types treated by Galton as Whorls 213 XXVI. Galton's method of counting Ridges in Loops. Illustration of dabbed

and rolled prints .   21.3

XXVII. Illustrations of Galton's Secondary Classificatory Symbols (i, f, c)   213

XXVIII. Illustrations of Galton's Secondary Classificatory Symbols (y, v, vy)   213 XXIX. Galton's Secondary Classificatory Symbols applied to Noteworthy

' Peculiarities 213 XXX. Illustration of the use of Galton's Secondary Classificatory Symbols 213 XXXI. Francis Galton, the Founder of the Science of Eugenics, from a photo

graph of 1902, by the late Mr Dew-Smith. (By kind permission of

Mrs Dew-Smith) .   217