The Cambridge University Press, Fetter Lane, London, E.C., and their Agents, 
are now the sole agents for the sale of the following publications of the 
Gallon and Biometric Laboratories, U niversity of London : 
BIOMETRIC LABORATORY PUBLICATIONS 
Drapers' Company Research Memoirs. 
I. 
II. 
III. 
IV. 
Biometric Series. 
Mathematical Contributions to the 
Thcoryof Evolution.— XIII. On the Theory 
of Contingency and its Relation to Associa- 
tion and Normal Correlation. By Karl 
Pearson, F.R.S. Price -is. net. 
Mathematical Contributions to the 
Theoryof Evolution.— XIV. On the Theory 
of Skew Correlation and Non-linear Regres- 
sion. By Karl Pearson, F.R.S. Price 5s. 
net. 
Mathematical Contributions to the 
Theoryof 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. 
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. A Co- 
operative Study. \_Shortly. 
VI. Albinism in Man. By Karl Pearson, 
E. Nettleship, and C. H. Usher. Text, 
Part I, and Atlas, Part 1. Price 35«. net. 
VII. Mathematical Contributions to the 
Tlieory of Evolution. — XVIII. On a Novel 
Method of Regarding the Association of 
two Variates classed solely in Alternative 
Categoi'ies. By Karl Pearson, F.R.S. 
Price 4s. net. 
VIII. Albinism in Man. By Karl Pearson, 
E. Nettleshtp, 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. Price 21s. net. 
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., D.Sc. 
Price 3.S. net. Sold only with complete sets. 
II. A First Study of the Statistics of 
Pulmonary Tuberculosis (Inheritance). By 
Karl Pearson, F.R.S. Price 3s. net. 
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. 
Price 3s. net. 
IV. The Health of the School-Child in re- 
lation to its Mental Characters. By Karl 
Pearson, F.R.S. [Shortly. 
V. On the Inheritance of the Diathesis 
of Phthisis and In.sanity. A Statistical 
Study based upon the Family History of 
1,500 Criminals. By Charles Goring, 
M.D., B.Sc. Price 3s. net. 
VI. A Third Study of the Statistics of 
Pulmonacy 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 aud 
Cla.ss Differences. By M. H. Williams, 
M.B., .JoLiA Bell, M.A., and Karl 
Pearson, F.R.S. Price 6s. net. 
Technical 
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 Pear.son, F.R.S. Issued. Price ?js. net. 
II. On some Disregarded Points in the 
Stability of Masonry Dams. By L. W. 
Atcherley, assisted by Karl Pearson, 
F. R.S. Issiieci. Price 3s. 6d net. 
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 5s. net. 
Complete sets may be 
Series. 
IV. On Torsional Vibrations in Axles 
and Shafting. By Karl Pearson, F.R.S. 
Issued. Price 6s. net. 
V. An Experimental Study of the 
Stresses in JNIasonry Dams. By Karl 
Pearson, F.R.S., and A. F. Campbell 
Pollard, assisted by C. W. Wheen, B.Sc. 
Eng., and L. F. Richardson, B.A. Issued. 
Price Is. net. 
VI. On a Practical Theory of Elliptic and 
Pseudo-elliptic Arches, with special refer- 
ence 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. net. 
purchased at 25s. 7iet. 
