BIOMETRIC LABORATORY PUBLICATIONS 
Drapers' Company Research Memoirs. 
BiometHc Series. 
I. Mathematical Contributions to the 
Theoryof Evolution.— XIII. On the Theory 
of Contingency and its Relation to Associa- 
tion and Normal Correlation. By KARit 
Pearson, F.R.S. Price 4s. net. 
II. Mathematical Contributions to the 
Theoryof E\^lution.— XIV. On the Theory 
of Skew Correlation and Non-linear Regres- 
sion. By Karl Pearson, F.R.S. Price 5s. 
net. 
m. 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. Price 5s. net. 
IV. Mathematical Contributions to the 
Theory of Evolution.— XVI. On Further 
Methods of Measuring Correlation. By 
Karl Pearson, F.R.S. Price 4s. net. 
V. Mathematical Contributions to the 
Theory of Evolution.— XVII. On Homo- 
typosis in the Animal Kingdom. By EiSnest 
Warren, D.Sc, Alice Lee, D.Sc, Edna 
Lea-Smith, Marion Radford, and Karj. 
Pearson, F.R.S. [Shwtly. 
VI. Albinism in Man. By Karl Pearson, 
E. Nettleship, and C. H. Usher. Text, 
Part I, and Atlas, Part I. 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. 
Price 4s. net. 
VIII. Albinism in Man. By Karl Pearson, 
E. Nettleship, and C. H. Usher. Text, 
Part II, and Atlas, Part II. Price 30s. net. 
IX. Albinism in Man. By Karl Pearson, 
E. Nettleship, and.C. H. Usher. Text, 
Part IV, and Atlas, Part IV. Prici 21s. net. 
Studies in National Deterioration. 
II. 
III. 
IV. 
II. 
III. 
IX. 
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. 
Pri.ce 3s. Sold only with complete sets. ' 
A First Study of the Statistics of 
Pulmonary Tuberculosis (Inheritance). By 
Karl Pearson, F.R.S. .Price 3s. net. 
A Second Study of the Statistics of 
Pulmonary Tuberculosis. Marital lufec- 
tion. By Ernest Pope, revised by Karl 
Pearson, F.R.S. With an Appendix on 
Assortative Mating by Ethel M. Elderton. 
Price 3s. net. 
The Health of the School-Child in re- 
lation to its Mental Characters. By Karl 
Pearson, F.R.S. [Shortly.^ 
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. Price 3s. 7iet. 
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. Price 3s. net. 
VII. On the Intensity of Natural Selection 
in Man. (On the Relation of Darwinism 
to the Infantile Death-rate.) By E. C. 
Snow, D.Sc. Price 3s. net. 
VIII. A Fourth Study of the Statistics of 
Pulmonary Tuberculosis : the Mortality of 
the Tuberculous : Sanatorium and Tuber- 
culin Treatment. By W. Palin Elderton, 
F.I. A., and Sidney J. Perry, A. I. A. 
Price 3s. net. 
IX. A Statistical Study of Oral Tem- 
peratures in School Children with special 
reference to Parental, Environmental and 
Class Differences. By M. H. Williams, 
M.B., JcLiA Bell, M;A., and Karl 
Pearson, F.R.S. Price 6s. net. 
Questions of the Day and of the Fray. 
The Influence of Parental Alcoholism 
on the Physique .and Ability of the Ofl- 
spring. A Reply to the Cambridge Econo- 
mists. By Karl Pearson, F.R.S. Price 
Is. net. * 
Mental Defect, Mal-Nutrition, and 
the Teacher's Appreciation of Intelligence. 
A Reply to Criticisms of the Memoir on 
' The Influence of Defective Physique and 
Unfavourable Home Ertvironment on the 
Intelligence of School Children.' By David 
Heron, D.Sc. Price Is. net. 
An A|;tempt to correct some of the 
Misstatements made by Sir Victor Hors- 
LEY, F.R.S., F.R.C.S., and Mary D. Sturge, 
M.D., in their Criticisms of the Memoir-: 
'A First Study of the Influence of Parental' 
Alcoholism,' &c. By Karl Pearson, F. R.S. 
Price Is. net. 
IV. 
The Fight against Tuberculosis and 
the Death-rate from Phthisis. By Karl 
Pearson, F.R.S. Price Is. net. 
Social Problefcis : Their Treatment, 
Past, Present and Future. By Karl 
Pearson, F.R.S. Price Is. net. 
Eugenics and Public Health. Lecture 
to the York Congress of the Royal Sanitary 
Institute. By Karl Pearson, F.R.S. Price 
Is. net. 
Mendelism and the Problem of Mental 
" Defect. I. A Criticism of Recent American 
Work. By David Heron, D.Sc. (Double 
Number.) Price 2s. net. 
VIII. Mendelism and the Problem of Mental 
Defect. II. The Continuity of Mental 
Defect. By Karl Pearson, F.R.S., and 
Gdstav a. Jaederholm. Pri^e Is. net. 
V. 
VI. 
VII. 
Mendelism and the Problem of Mental Defect. III. On the Graduated Character of 
Mental Defect, and on the need for standardizing Judgments as to the Grade of Social InefiBiciency 
which shall involve Segregation. By Karl Pearson, F.R.S. (Double Number.) Price 2s. net. 
THE ABOVE MAY BE OBTAINED FROM DULAU & CO., Ltd., 37, SOHO SQUARE, LONDON, W. 
