The publication of a paper in Biometrika marks that in the Editors' opinion 
it contains either in method or material something of interest to biometricians. 
But the Editors desire it to be distinctly understood that such publication does not 
mark their assent to the arguments used or to the conclusions drawn in the paper. 
UNIVERSITY OF LONDON, UNIVERSITY COLLEGE. 
Drapers' Company Research Memoirs. 
Biometric Series. 
I. Mathematical Contributions to the Theory of Evolution. — XIII. On, the 
Theory of Contingency and its Relation to Association and' Normal Corre- 
lation. By Karl Pearson, F.II.S. Issued. Price 4s. 
II. Mathematical Contributions to the Theory of Evolution.— XIV. On the 
Theory of Skew Correlation and Non-linear Regression. By Karl 
Pearson, F.R.S. Issued. Price 5s. 
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 .5.s. 
IV. , Mathematical Contributions to the Theory, of Evolution. — XVI. On Further 
Methods of Measuring Correlation. By Karl Pearson, F.R.S. Issued. 
Price 4s. ' 
V. Mathematical Contributions to the Theory of Evolution. — XVII. On Homo- 
typosis in the Animal Kingdom. By Ern^st Warren, D.Sc, Alice Lee, 
D.Sc, Edna Lea-Smith, Marion Radford, and Karl Pearson, F.R.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, 
II. A First Study of the Statistics of Pulmonary Tuberculosis. By Karl 
Pearson, F.R.S. Issued. Price 3s. 
Francis Galton Laboratory for National Eugenics. 
Eugenics . Laboratory Memoirs. 
I. The Inheritance of Ability. Being a Statistical Study of the Oxford Class 
Lists and of the School Lists of Harrow and Charterhouse. By Edgar 
Schuster and Ethel M. Elderton. Issued. Price 4s. 
II. A First Study of the Statistics of Insanity and the Inheritance of the Insane 
Diathesis. By David Heron. Issued. Price 3s. 
III. The Promise of Youth and the Performance of Manhood. (Bar and Church.) 
By Edgar Schuster. Issued. Price 2s. Qd. 
IV. On the Measure of the Resemblance of First Cousins. By Ethel M. 
Elderton, assisted by K. Pearson. Issued. Price 3s. 
V. A First Study of the Inheritance of Eye Defect and the Influence of Environ- 
ment on Sight. By Amy Barrington. Shortly. 
THE ABOVE MAY BE OBTAINED FROM DULAU & CO., 37, SOHO SQUARE, LONDON, W. 
