Vol. V. Part III. 
February 1907 
BIOMETEIKA 
A JOURNAL FOR THE STATISTICAL STUDY OF 
BIOLOGICAL PROBLEMS 
FOUNDED BY 
W. F. R. WELDON, FRANCIS GALTON and KARL PEARSON 
. EDITED 
IN CONSULTATION WITH FRANCIS GALTON 
AND' IN COLLABORATION WITH ' 
C. B. DAVENPORT W. R. MACDONELL 
W. PALIN ELDERTON .RAYMOND PEARL 
BY 
KARL PEARSON 
CAMBRIDGE ^ 
AT THE UNIVEKSITY PRESS 
LONDON: CAMBBIDGE UNIVEKSITY PEES8 WAREHOUSE, FETTER LANE 
(C, F. CLAY, Managee) 
AND H. K.. LEWIS, GOWER STREET 
NEW tore: g. p. pdtnam's sons 
LEIFBIC: BBOOKBAUS 
BOMBAY AND CALCUTTA : MACMILLAN AND CO., LIMITED 
Entered at the New York Post G^ce as Second Class Matter. 
Price Ten Shillings net. 
[Ismed February 6, 1907] 
