VOL. XLIU, NO. 508 



THE 



APRIL, 1809 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 



Devoted to the Advancement of the Biological Science* with 

 Special Reference to the Factors of Evolution 



CONTENTS 



Heredity of Hair Color in Man. GERTRUDE C. DAVENPORT and CHARLES C 



DAVEHPORT. 



A Mechanism for Organic Correlation. Professor G. H. PARKER. • 



Vascular Anatomy and the Reproductive Structure*. Professor * un* 



The Progress of Plant Anatomy during the Last Decade. ^ ofe8Mr 230 



EDWARD C. JEFFREY jfr- • * 



norter Articles and Correspondence : A Note on the ^f^^^SSS Sf 

 B e eed-° met O C f ° D8tantS ' Raymoni>:Peabl. Pure .Strains as Artifacts 01^ 



•otes and Literature : mredity-The Nature of " Unit ^?<L- 

 SPIIXMAN. Environment-^. FRANK E. LUTZ. „^^"f^SJJ^ 

 Hybridology and Gynandromorphism, Professor T. H. Morgan. 2*»« 2 „ 

 "w<a-Red Sea Crinoids, DR. Austin Hobaet Clabk. • • • 



THE SCIENCE PRESS 

 LANCASTER, PA, GARRISON, N. Y. 



NEW YORK : SUB-STATION 84 



