Vol. VIII. Parts III and IV. 
January 1912 
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 
CAMBRIDGE 
AT THE UNIVERSITY PRESS 
LONDON: FETTER LANE, E.C. 
(C. F. CLAY, Manager) 
and H. K. LEWIS, GOWER STREET 
EDINBURGH : 100, PRINCES STREET 
NEW YORK: G. P. PUTNAM'S SONS 
^.BERLIN : A. ASHER AND CO. 
LEIPSic: BBOCKHAUS 
BOMBAY AND CALCUTTA: MACMIBLAN AND CO., LIMITED 
Entered at the New York Post Office as Second Class Matter 
Price- Twenty Shillings net. 
[Ismied February 27, 1912] 
