Vol. XII. Parts I and II 
November, 19ia 
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 UNIVERSITY PRESS 
C. F. CLAY, Managbb 
LONDON! FETTEE LANE, E.G. 4 
also 
H. K. LEWIS AND CO., LTD., 136, GOWEB STREET, LONDON, W.C. 1 
WILLLiM WESLET AND SON, 28, ESSEX STKEET, LONDON, 11^.0.2 
CHICAGO : UNIVEESITT OF CHICAGO PRESS 
BOMBAY, CALCCTTA AND MADBAS : JHACMILLAN AND CO., LIMITED 
TORONTO : J. M. DENT AND SONS, LIMITED 
TOKYO: THE MAECZEN-KABUBHIKI-KAISHA 
Price Twenty Shillings 
[Ismed Novemher 28, 1918] 
