STATISTICAL METHODS 



WITH SPECIAL REFERENCE TO 



BIOLOGICAL VARIATION. 



BY 



C. B. DAVENPORT, 



Head of Department of Experimental Biology and Director of Station 

 for Experimental Evolution of the Carnegie Institution. 



SECOND, REVISED EDITION. 

 FIRST THOUSAND. 



NEW YORK : 



JOHN WILEY & SONS. 



LONDON : CHAPMAN & HALL, LIMITED. 



1904. 



