BIOMETRIKA 
A JOURNAL FOR THE STATISTICAL STUDY OF 
BIOLOGICAL PROBLEMS 
FOUNDED BY 
W. F. R. WELDON, FRANCIS GALTON and KARL PEARSON 
EDITED BY 
KARL PEARSON 
VOLUME IX 
January 1913 to October 1913 
If 
CAMBRIDGE 
AT THE UNIVERSITY PRESS 
LONDON: FETTER LANE, E.C. 
(C. F. CLAY, Manager) 
and H. K. LEWIS, GOWER STREET 
WILLIAM WESLEY AND SON, 28, ESSEX STREET, STRAND 
EDINBURGH : 100, PRINCES STREET 
CHICAGO : UNIVERSITY OF CHICAGO PRESS 
BERLIN : A. ASHER AND CO. 
LEIPSIC : BROCKHAUS 
BOMBAY AND CALCUTTA: MACMILLAN AND CO., LIMITED 
TORONTO : J. M. DENT AND SONS, LIMITED 
TOKYO : THE MARUZUN-KAIiUSHIKI-KAISHA 
[All rights reserved] 
