BIOMETRIC LABORATORY PUBLICATIONS 
Drapers' Company Research Memoirs. 
Biometric Series. 
I. Mathematical Contributions to the 
Theory of Evolution.— XIII. On the Theory . 
of Contingency and its Relation to Associa- 
tion and Normal Correlation. By Karl 
Pearson, P.R.S. Issued. Price 4s. net. 
II. Mathematical Contributions to the 
Theory of Evolution.— XIV. On the Theory 
of Skew Correlation and Non-linear Regres- 
sion. By Karl Pearson, F.R.S. Issued. 
Price 5s. net. 
III. Mathematical Contributions to the 
Theory of Evolution.— XV. On the Mathe- 
matical Theory of Random Migration. By 
Karl Pearson, F.R.S., with the assistance 
of John Blakeman, M.Sc. Issued. Price 
5s. net. 
IV. Mathematical Contributions to the 
Theory of Evolution.— XVI. On Further 
Methods of Measuring Correlation. By 
Karl Pearson, F.R.S. Issued. Price 4s. net. 
V. Mathematical Contributions to the 
Theory of Evolution.— XVII. On Homo- 
typosis in the Animal Kingdom. By Ernest 
Warren, D.Sc., Alice Lee, D.Sc, Edna 
Lea-Smith, Marion Radford, and Karl 
Pearson, F.R.S. Shortly. 
VI. Albinism in Man. By Karl Pearson, 
E. Nettleship, and C. H. Usher. Text, 
Part I, and Atlas, Part I. Issued. Price 
35s. net. 
VII. Mathematical Contributions to the 
Theory of Evolution.— XVIII. On a Novel 
Method of Regarding the Association of 
two Variates classed solely in Alternative 
Categories. By Karl Pearson, F.R.S. 
Issued. Price 4s. net. 
VIII. Albinism in Man. By Karl Pearson, 
E. Nettleship, and C. H. Usher. Text, 
Part II, and Atlas, Part II. Issued. Price 
30s. net. 
IX. Albinism in Man. By Karl Pearson, 
E. Nettleship, and C. H. Usher. Text, 
Part IV, and Atlas, Part IV. Issued. Price 
21s. net. 
Studies in National Deterioration. Price 3s. net each. 
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., D.Sc. 
Issued. Sold only with complete sets. 
II. A First Study of the Statistics of 
Pulmonary Tuberculosis (Inheritance). By 
Karl Pearson, F.R.S. Issued. 
III. A Second Study of the Statistics of 
Pulmonary Tuberculosis. Marital Infec- 
tion. By Ernest G. Pope, revised by Karl 
Pearson, F.R.S. With an Appendix on 
Assortative Mating by Ethel M. Elderton. 
Issued. 
IV. The Health of the School-Child in 
relation to its Mental Characters. By 
Karl Pearson, F.R.S. Shortly. 
V. On the Inheritance of the Diathesis 
of Phthisis and Insanity. A Statistical 
Study based upon the Family History of 
1,500 Criminals. By Charles Goring, 
M.D., B.Sc. Issued. 
VI. A Third Study of the Statistics of 
Pulmonary Tuberculosis. The Mortality 
of the Tuberculous and Sanatorium Treat- 
ment. By W. P. Elderton", F.I.A. and 
S. J. Perry, A. I. A Issued. 
VII. On the Intensity of Natural Selection 
in Man. By E. C. Snow, D.Sc, Issued. 
ViH. A Fourth Study of the Statistics of 
Pulmonary Tuberculosis : the Mortality of 
the Tuberculous : Sanatorium and Tuber- 
culin Treatment. By W. Palin Elderton, 
F.l.A. f and Sidney J. Perry, A. I. A. 
Issued. 
Questions of the Day and of the Fray. Price Is. net each (VII excepted). 
I. The Influence of Parental Alcoholism 
on the Physique and Ability of the Off- 
spring. A Reply to the Cambridge Econo- 
mists. By Karl Pearson, F.R.S. 
II. Mental Defect, Mai-Nutrition, and 
the Teacher's Appreciation of Intelligence. 
A Reply to Criticisms of the Memoir on 
' The Influence of Defective Physique and 
Unfavourable Home Environment on the 
Intelligence of School Children.' By David 
Heron, D.Sc. 
. III. An Attempt to correct some of the 
Misstatements made by Sir Victor Hors- 
ley, F.R.S., F.R.C.S., and Mary D. Stdrge, 
M.D., in their Criticisms of the Galton 
Laboratory Memoir : ' A First Study of 
the Influence of Parental Alcoholism,' &c. 
By Karl Pearson, F.R.S. 
IV. The Fight against Tuberculosis and 
the Death-rate from Phthisis. By Karl 
Pearson, F.R.S. 
V. Social Problems : Their Treatment, 
Past, Present and Future. By Karl 
Pearson, F.R.S. 
VI. Eugenics and Public Health. Lecture 
to the York Congress of the Royal Sanitary 
Institute. By Karl Pearson, F.R.S. 
VII. Mendelism and the Problem of Mental 
Defect. I. A Criticism of Recent American 
Work. By David Heron, D.Sc. Issued 
(Double Number). Price 2s. net. 
THE ABOVE MAY BE OBTAINED FBOM DULAU & CO., Ltd., 37, SOHO SQUABE, LONDON, W. 
