Vol. X. Part IV 
May, 1915 
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. p. CLAY, Manager 
LONDON: FETTEE LANE, E.G. 
EDINBURGH : 100, PRINCES STREET 
I also 
H. K. LEWIS, 136, GOWER STREET, LONDON, W.C. 
- WILLIAM WESLEY AND SON, 28, ESSEX STREET, LONDON, W.C. 
CHICAGO : UNIVERSITY OF CHICAGO PRESS 
BOMBAT, CALCUTTA AND KADRAS : MACMILLAN AND CO., LIMITED 
TORONTO : J. M. DENT AND SONS, LIMITED 
TOKYO : THE MARUZEN-KABUSHIKl-KAISHA 
Price Ten Shillings net 
[Issued June 4, 1915] 
