CONTENTS 
{All Rights reserved) 
PAGE 
I. Canary Breeding. A Partial Analysis of Records from 1891 — 1909. 
By A. Rudolf Galloway. (With Plates I — V (4 coloured) and 
Four Diagrams in the text) 1 
II Tables of the T-Fu notion prepared by J. H. Duffell ... 43 
III. A Second Cooperative Study of Vespa vulgaris. Comparison of 
Queens of a Single Nest and Queens of a General Population. By 
E. Y. Thomson, Julia Bell and Karl Pearson, F.R.S. (With 
Three Diagrams in the text) 48 
IV. The Opsonic Index— A Medico-Statistical Enquiry. By W. F. Harvey 
and Anderson M^Kendrick. (With Seven Diagrams in the 
• text) 64 
V. On a New Method of Determining Correlation between a measured 
character A and a character B, of which only the Percentage of 
cases wherein B exceeds (or falls short of) a given Intensity is 
Recorded for each Grade of il. By Karl Pearson, F.R.S. . . 96 
• VI. On Inheritance in the Production of Butter Fat. By H. L. RiETZ . 106 
VII. Tables to facilitate the computation of the Probable Errors of the 
Chief Constants of Skew FrequeUcy Distributions. By A. Rhind. 
(With Two Diagrams in the text) 127 
VIII. On the Relation between the Symmetry of the Egg, the Symmetry of 
Segmentation, and the Symmetry of the Embryo in the Frog. By 
J. W. Jenkinson. (With Seven Diagrams in the text) . . 148 
Miscellanea, (i) On the Distribution of the Means of Samples which are 
not drawn at Random. By Student . . . .210 
(ii) A short method of calculating the Coefficient of Corre- 
lation in the case of Integral Variates. By J. Arthur 
Harris . . 214 
(iii) Note on Variation in Adoxa. By J. Arthur Harris . 218 
(iv) On the Association of Drawing with other Capacities in 
School Children. By Ethel M. Elderton . . 222 
(v) Variability in Shirley Poppies from Pretoria. By G. D. 
Maynard. (With Three Diagrams in the text) . 227 
(vi) Some recent Criminological Works. By Charles Goring 231 
(vii) Note on Partial Leucosis in a Hen. By W. Coles 
Finch. (With Five Diagrams in the text) . . . 234 
Biometrika appears about four times a year. A volume containing about 
500 pages, with plates and tables, is issued annually. 
Papers for publication should be sent to Professor Karl Pearson, Uni- 
versity College, London. It is very desirable that a copy of all measurements 
made, not necessarily for publication, should accompany each paper. In all cases 
the papers themselves should contain not only the calculated constants, but the 
distributions from which they have been deduced. Diagrams and drawings should 
be sent in a state suitable for direct photographic reproduction, and if on decimal 
paper it should be blue ruled, and the lettering only pencilled. 
Books and offprints for review or notice in the bibliography should be sent to 
Prof. Pearson, and, when a second copy is available, to Dr Raymond Pearl, 
Maine Agricultural Experiment Station, Orono, Maine, U.S.A. 
Papers will be accepted in German, French or Italian. In the first 
case the manuscript should be in Roman not German characters. 
Contributors receive 25 copies of their papers free. Twenty-five or 'fifty 
additional copies may be had on payment of 3/6 or 6/- respectively per sheet of 
eight pages:, these should be ordered when the final proof is returned. 
The subscription price, payable in advance, is 30s. net per volume (post free); 
single numbers 10s. net. Volumes' I, II, III, IV, V and VI (1902—9) complete, 
30s. net per volume. Bound in Buckram 34/6 net per volume. Index to Volumes 
I to V, 2s. net. Subscriptions may be sent to C. F. Clay, Cambridge Universjity 
Press, Fetter Lane, London, E.G., either direct or through any bookseller, and 
communications respecting advertisements should also be addressed to C. F. Clay. 
Till further notice new subscribers to Biometrika may obtain Vols. I — VI 
together for £7. 10s. — or bound in Buckram for £8. 15s. 
