Vol. XI. Part IV 
May, 1917 
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, Manaqeb 
LONDON: FETTER LANE, B.C. 4 
EBINBDKQH : 100, PRINCES 8TKEBT 
also 
H. K. LEWIS AND CO., LTD., 136, GOWER STREET, LONDON, W^C. 1 
WILLIAM WESLEY AND SON, 28, ESSEX STREET, LONDON, W.C.2 
CHICAGO : UNIVERSITY OP CHICAGO PRESS 
BOMBAY, CALCUTTA AND MADRAS: MACMILLAN AND CO., LIMITED 
TORONTO : J. M. DENT AND SONS,. LIMITED 
TOKYO,: THE MARUZEN-KABUSHIKI-KAISHA 
Price Ten Shillings 
[Issued June 30, 1917] 
