toi. xim, HO. 410 



JUNE, HOT 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 



Devoted to the Advancement of the Biological Sciences with 

 Special Reference to the Factors of Evolntion 



CONTENTS 

 Heredity and Variation In the Simplest Organisms. 

 The Color Sense of the Hi 



Flowers? JOHN H. LOVELL J 



:. Variation in tne Number of Seeds per Pod in the Broom, Cytisus scoparins. 



Dr. J. ARTHUR HARRIS 3 



. Present Problems In Plant Ecology: 



The Trend of Ecological Philosophy. Professor HENRY C. COWLES . . 3 

 The Present Problems of Physiological Plant Ecology. Dr. BURTON 



. K. DeVries's Species and Vari- 

 -On the Totipotent of the First 

 leres of the Frog's Egg, Db. J. F. Mc&JBNDOK ... 3 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, N. Y. 



NEW YORK : SUB-STATION 84 



