IV 
Contents 
XIII. 
XIV. 
XV. 
XVI. 
XVII. 
XVIII. 
XIX. 
XX. 
XXI. 
Notes on the Pigmentation of the Human Iris. By A. Rudolf 
Galloway 
The Increase in the Number of Erythrocytes with Altitude. By 
Hugh W. Acton and W. F. Harvey 
A Study of the Negro Skull with Special Reference to the Congo 
and Gaboon Crania. By the late R. Crewdson Benington. 
Prepared for press by Karl Pearson . . . . 
On the Relation of Stature and Weight to Pigmentation. By 
Ethel M. Elderton 
Pigmentation in Relation to Selection and to Anthropometric 
Characters. By A. M. Carr Saunders 
Supplementary Tables for finding the Correlation Coefficient from 
Tetrachoric Groupings. By P. F. Everitt . . . 
Note on the Extent to which the Distribution of Cases of Disease 
in Houses is determined by the Laws of Chance. By J. McD. 
Troup and G. D. Maynard 
On the Appearance of Multiple Cases of Disease in the same 
House. By Karl Pearson 
Growth, Variability and Correlation in Young Trout. By J. W. 
.Tenkinson 
267 
280 
292 
340 
354 
385 
396 
404 
444 
Miscellanea. 
(i) Note on the Age Distribution of Deaths from Diabetes Mellitus. 
By G. D. Maynard ......... 225 
(ii) On Pulse and Breathing Rates and their Relation to Stature. 
By Julia Bell 232 
(iii) The Tooth-Brush and Decayed Teeth. By Frank Rock . . 237 
(iv) Note on High Values of f3 l3 /3 2 . By Georg Duncker . . . 238 
(v) Further Remarks on the Law of Ancestral Heredity. By Karl 
Pearson . . . 239 
(vi) The Inheritance of Fertility. By R. E. Lloyd .... 244 
(vii) Remarks on Professor Lloyd's Note on Inheritance of Fertility. 
By Karl Pearson 247 
(viii) On the Probability that two Independent Distributions of Frequency 
are really Samples from the same Population. By Karl Pearson 250 
