iv 
Contents 
XIV. Numerical Illustrations of the Variate Difference Correlation 
Method. By Beatrice M. Cave and Karl Pearson . . 340 
XV. An Examination of some Recent Studies of the Inheritance Factor 
in Insanity. By David Heron 356 
XVI. On the Probable Error of the Bi-Serial Expression for the Corre- 
lation Coefficient. By H. E. Soper 384 
XVII. On the Partial Correlation Ratio. Part I, Theoretical. By L. 
ISSERLIS 391 
XVIII. Association of Finger-Prints. By H. Waite .... 421 
XIX. On the Problem of Sexing Osteometric Material. By Karl Pearson 479 
XX. Further Evidence of Natural Selection in Man. By Ethel M. 
Elderton and Karl Pearson 488 
XXJ. Frequency Distribution of the Values of the Correlation Coefficient 
in Samples from an indefinitely large Population. By R. A. 
Fisher .507 
XXII. Appendix to Papers by Studc-nt " and R. A. Fisher. Editorial 522 
XXIII. Tuberculosis and Segregation. By Alice Lee .... 530 
XXIV. The Influence of Isolation on the Diphtheria Attack- and Death- 
rates. By Ethel M. Elderton and Karl Pearson . . 549 
Miscellanea. 
(i) The Statistical Study of Dietaries, a Reply to Professor Karl Pearson. 
By D. Noel Paton 169 
(ii) The Statistical Study of Dietaries, a Rejoinder. By Karl Pearson 172 
(iii) Note on the Essential Conditions that a Population breeding at 
random should be in a Stable State. By Karl Pearson . 175 
(iv) The Elimination of Spurious Correlation due to Position in Time or 
Space. By "Student" 179 
(v) On certain Errors with regard to Multiple Correlation occasionally 
made by those who have not adequately studied the Subject. 
By Karl Pearson 181 
(vi) Formulae for the Determination of the Capacity of the Negro Skull 
from External Measurements. By L. IssERLls .... 188 
(vii) - Note on a Negro Piebald. By C. D. Maynard . . , .193 
(I 
