Vol. IX. Parts I and II. March 1913 
BIOMETEIKA 
A JOURNAL FOR THE STATISTICAL STUDY OF 
BIOLOGICAL PROBLEMS 
FOUNDED BY 
W. F. R. WELDON, FRANCIS GALTON and KARL PEARSON 
EDITED BY 
KARL PEARSON 
CAMBRIDGE 
AT THE UNIVERSITY PRESS 
LONDON: FETTER LANE, E.C, 
(C. F. CLAY, Manager) 
and H. K. LEWIS, GOWEK STREET 
WILLIAM WESLEY AND SON, 28, ESSEX STREET, STEAND 
EDINBURGH .: 100, PRINCES STREET 
CHICAGO : UNIVERSITY OF CHICAGO PRESS 
BERLIN : A. ASHER AND CO. 
LEIPSIC: BROCKHAUB 
BOMBAY AND CALCUTTA I MACMILLAN AND CO., LIMITED 
Entered at the New York Post Office as Second Class Matter 
Price Twenty Shillings net. 
[Issued March 12, 1913] 
WAR 25 1918 
'°nal Muse 
