VOL. XLV, HO. 530 



THE 



FEBRUARY, 1911 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Science! with 

 Special Reference to the Factors of Evolution 



CONTENTS 



The Application of the Conception of Pure Lines to Sex Limited Inherit- 

 ance and to Sexual Dimorphism. Professor T. H. Morgan 



Pure Lines in the Study of Genetics in Lower Organisms. Professor H S 

 Jennings 



Some Effects of Temperature upon Growing Mice, and the Persistence of 



Such Effects in a Subsequent Generation. Dr. Francis B. Sumner 

 The Mendelian Ratio and Blended Inheritance. Shinkishi Hatai - 

 Data on the Relative Conspicuousness of Barred and Self-colored Fowls. 



Dr. Raymond Pearl ; 



Some Considerations concerning the Photogenic Function in Marine Organ- 

 isms. F. Alex. McDermott i 



lmetrical Tables are commonly used. Professor H. S. jENNlNGf 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, N. T. 



NEW YORK : SUB-STATION 84 



