VOL. XLV, HO. 540 



DECEMBER, 1911 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Sciencei with 

 Special Reference to the Factors of Evolution 



CONTENTS 



I. The Inheritance of Color in Short-horn Cattle. H. H. Lacghltn - - - 705 

 n. studies on Melanin. Dr. Ross Aiken Gortner 743 



Dr. Raymond Pearl, Lottie E. McPheters - - - ° - P - 756 



V. Index to Volume XLV ...763 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, N. Y. 



NEW YORK : SUB-STATION 84 



