Published by DulAU and Co 4 , Soho Square, London, W. 



DRAPERS' COMPANY RESEARCH MEMOIRS. 



DEPARTMENT OF APPLIED MATHEMATICS, UNIVERSITY COLLEGE, 



UNIVERSITY OF LONDON. 



These memoirs will be issued at short intervals. 



Biometric Series. > 



I. Mathematical Contributions to the Theory of Evolution.— XIII. On the Theory of 



Contingency and its Relation to Association and Normal Correlation. By Karl 

 Pearson, F.R.S. Issued. Price is. 



II. Mathematical Contributions to the Theory of Evolution. — XIV. Oil the Theory of Skew 



Correlation and Non-linear Regression. By Karl Pearson, F.R.S. Issued. Price 5«. 



III. Mathematical Contributions to the Theory of Evolution. — XV. On the Mathematical 



Theory of Random Migration. By Karl PEARSON, F.R.S., with the assistance of 

 John Blakeman, M.Sc. Issued. Price 5s. . 



IV. Mathematical Contributions to the Theory of Evolution.r-XVI. On Homotyposis in the 



Animal Kingdom. By Ernest Warren, D.Sc., Alice Lee, D.Sc, Edna Lea-Smith, 

 Marion Radford and Karl Pearson, FR.S. Shortly. 



Studies in National Deterioration. 



I. On the Relation of Fertility in Man to Social Status, and on the changes in this : 

 Relation that have taken place in the last 50 years. By David Heron, M.A. 

 Issued. Price 3s. 



Technical Series. 



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

 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. Pride 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.RS. Issued. 



Price 6s. 

 V. A Further Study of the Stresses in Masonry Dams. By Karl PEARSON, F.R.S., and 

 A. Fi C. Pollard, assisted by C. Wheen. : , Shortly. 



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. 



Edited by Karl Pearson in Consultation with Francis Galton. 



Vol. V-, Parts I. & II. 



I. Walter Frank Raphael , Weldon. 1860—1906. 

 „ (With two Portraits and three Plates.) 



II. Variation in ChUomonas under Favourable and Un- 



favourable Conditions. (With seven, Figures 

 in the text.) By Raymond Pearl. 



III. The Non-Inheritance of Sex in Man. : By Frede- 



rick Adams Woods, M;D. - 



IV. On the Inheritance; of the Sex- Ratio, By David 



Heron, M.A. ' 



V. A Second Study of the English Skull, with special 



Reference to the Moorfields Crania.- (With 

 superimposed Maps and 12 Plates of Crania, 

 and four folding Tables.) By W. R. MAC- 



DONELL. 



VI. On the Relationship of Intelligence, to Size and 



Shape of .Head, and to other Physical and 

 Mental Characters. (With nine Figures in 

 the text.) By Karl Pearson, F.R.S. 

 VII. On the Relation between the Symmetry of the. 

 Egg and the Symmetry of the Embryo in 

 the Frog {liana Temporaria). (With twelve 

 Figures in the text.) By J. W. Jenkinson, 

 D.Sc. 



Miscellanea, 

 (i) Skew Frequency Curves. A Rejoinder to Professor 



, Kapteyn. By Kahd Pearson, F.R.S. 

 (ii) On the Curves which' are most suitable for de- 



scribing the Frequency of Random Samples 

 of a Population, By Kabl Pearson, F.fcs. 



(hi) On certain Points connected with scale Order in 

 the Case of Correlation of two characters, 

 which for some arrangement give a Linear 

 Regression Line. By' Karl Pearson, F.R.S. 

 , (iv) On the Classification of Frequency Ratios. (With 

 one Figure in the text.) By D. M. Y. SoMMBR- 

 ville, D.Sc. 



(v) Note on the Significant or Non-Significant Charac- 

 ter of a Sub-sample drawn from a Sample. 

 By Karl Pearson, F.R.S. 



(vi) Professor Ziegler and Galton's Law of Ancestral 

 Inheritance. By Edgar Schuster, 



(vii) Variazione ed Omotiposi nelle infiorescenze di Ci- 

 ckorium Intubus L. (With two Figures in the 

 text.) By Dr Fernando de Helgueko. 



(viii) The Calculation of the Probable Errors of Certain 

 Constants of the Normal Curve. By Raymond 

 Pearl. 



(ix) On the Probable Error of the Coefficient of Mean 

 Square Contingency. By J. Blakeman, M.Sc. 

 and Karl Pearson, F.R.S. 



(x) On a Coemcierit of Class Heterogeneity or Di- 

 vergence. By Karl Pearson, F.R.S. 



(xi) Inheritance in the Female Line of Stye of Litter in 



Poland China Sows. By G. M. Rommel and 



. , E. F. Phillips. 



Notices and Bibliography. 



The subscription price, payable in advance, is Stig. net per volume (post free); single numbers 

 10s.net. Volumes I., II., III. and IV. (1902-6) complete, 30*. net per volume. Bound in Buckram 

 34s. 6<t. net per volume. Subscriptions may be sent to C. F. Clay, Manager, Cambridge University 

 Press Warehouse, Fetter Lane, London, E.C., either^ direct or through any bookseller. 



