Vol. XII. Parts III and IV 
November, 1919 
BIOMETEIKA 
A JOURNAL FOE THE STATISTICAL STUDY OF 
BIOLOGICAL PROBLEMS 
FOUNDED BY 
W. F. R. WELDON, FRANCIS GALTON and KARL PEA.RSON 
CAMBRIDGE UNIVERSITY PRESS 
C. F. CLAY, Managbb 
LONDON: FETTEB LANE, E.G. 4 
also 
H. K. LEWIS AND CO., LTD., 136, GOWEK STREET, LONDON, W.C, 1 
WILLIAM WESLEY AND SON, 28, ESSEX STREET, LOflDON, W.C. 2 
CHICAGO: UNIVERSITY OF CHICAGO PRESS 
BOMBAY, CALCUTTA AND MADRAS; MACMILLAN AND CO., LIMITED 
TORONTO : J. M. DENT AND SONS, LIMITED 
TOKYO: THE MARUZEK-EABUSHIKI-EAISHA 
Price Tiventy Shillings 
[hsiied 26 Nfyvember, 1919] 
