VOL XLVII, MO. 659 



JULY, 1913 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 DiTOtod to the Advancement of the Biological Science! with 



Special Reference to the Factors of Evolntion 



CONTENTS 



i Barred Plumage Pattern in 



jpB.Hadley - - - 

 td Discussion : The Geologic 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, H. f . 



NEW YORK: SUB-STATION 84 



