STATISTICAL METHODS 



WITH SPECIAL REFERENCE TO 



BIOLOGICAL VARIATION. 



BY 



C. B. DAVENPORT, 



Director of Department of Experimental Evolution, 

 Carnegie Institution of Washington. 



THIRD, REVISED EDITION. 

 FIRST THOUSaJSTI'. 



NEW YORK 



JOHN WILEY & SONS, INC. 

 LONDON: CHAPMAN & HALL, LIMITED 



