DRAPERS' COMPANY RESEARCH MEMOIRS (cont.). 



Technical Series. 



I. On a Theory of the Stresses in Crane and Coupling Hooks with Experi- 

 mental Comparison with Existing Theory. By E. S. Andrews, B.Sc. 

 Eng., assisted by Karl Pearson, F.R.S. Issued. Price 3s. 



II. On some Disregarded Points in the Stability of Masonry Dams. By L. W. 

 Atcherley, assisted by Karl Pearson, F.R.S. Issued. Price 3s. 6d. 

 III. On the Graphics of Metal Arches with special reference to the Relative 

 Strength of Two-pivoted, Three-pivoted and Built-in-Metal Arches 

 By L. W. Atcherley and Karl Pearson, F.R.S. Issued. Price 6s. 



IV. On Torsional Vibrations in Axles and Shafting. By Karl Pearson, 

 F.R.S. Issued. Price 6s. 



V. An Experimental Study of the Stresses in Masonry Dams. By Karl 

 Pearson, F.R.S., and A. F. Campbell Pollard, assisted b}^ C. W. 

 Wheen, B.Sc. Eng., and L. F. Richardson, B.A. Issued. Price ys. 



VI. On a Practical Theory of Elliptic and Pseudo-elliptic Arches, with special 

 reference to the ideal Masonry Arch. By Karl Pearson, F.R.S., 

 W. D. Reynolds, B.Sc. Eng., and W. F. Stanton, B.Sc. Eng. Issued.^ 

 Price 4s. 



Completed sets may be purchased at 25s. nel. 



Published by the Cambridge University Press 

 BIOMETRIKA 



A JOURNAL FOR THE STATISTICAL STUDY OF 

 BIOLOGICAL PROBLEMS 



Founded by W. F. R. Weldon, Francis Galton and Karl Pearson (Editor). 



Vol. IX. Parts I and II. Just ready. 



I. On the Probable Errors of Frequency Constants, Part II. Editorial. 



II. The Relationship between the Weight of the Seed planted and the 



Characteristics of the Plant produced. By J. Arthur Harris. 



III. On the Probable Error of a Coefficient of Correlation as found from a 



Fourfold Table, by Karl Pearson. 

 IV. Multiple Cases of Disease in the same House. By Karl Pearson. 

 V. A Study of the Variations in the Female Pelvis. By Arthur Brewster 

 Emmons. 



VI. The Intensity of Natural Selection in Man. By E. C. Snow. 

 VII. On Errors of Random Sampling. By M. Greenwood, Junr. 



VIII. On the Probable Error of the Correlation Coefficient to a Second Approxi- 

 mation. By H. E. SoPER. 

 IX. On the Measurement of the Influence of " Broad Categories " on Correla- 

 tion. By Karl Pearson. 



X. Bibliography of Current Literature, Biometry and Eugenics, Nos. 1-362. 

 XL On Theories of Association. By Karl Pearson and David Heron. 



Miscellanea {a) On the Hereditary Character of General Health. By Ethel 

 M. Elderton. (6) Note on the Honduras Piebald (with Four 

 Plates). By Karl Pearson, (c) The Correction to be made to the 

 Correlation Ratio for Grouping. By Student, (d) Selection and 

 Intermediates in Bacillus coli. By Leonard Keene Hirschberg. 



